As the curtains rise on another episode of "Miss Scarlet," we are transported to the esteemed St. Bridget’s School for Girls. Inside the headmistress's office, Rachel New, exuding stern authority, once again confronts a youthful Eliza, portrayed by Misa Knezevic. She harshly declares that Eliza is far from extraordinary, compelling her to jot down the humbling truth as if to imprint it indelibly upon her mind.
Flash forward to the present, where Eliza, now played by Kate Phillips, darts away from a knife-wielding assailant. Skinner, portrayed with menacing intensity by Brinisalv Jerkovic, traps her in a corner and accuses her of meddling. With composure, Eliza proposes to clear the air at Scotland Yard. Enter Detective Fitzroy (Evan McCabe), who promptly apprehends Skinner, an accused arsonist. Eliza, echoing her past scolding, tells Skinner she is nobody special.
The scene shifts to the Aurora Lane Theatre, where Fitzroy joins Chief Inspector Blake (Tom Durant-Pritchard), who is immersed in a murder investigation. Fitzroy confesses his disbelief that the renowned Abraham Barratt, a composer of melodious symphonies, had met his untimely demise. He reminisces about Barratt's collaborations, particularly with Mr. Kapoor, a talented storyteller. Blake reveals that Amil Kapoor (Nitin Ganatra) was the last person seen quarreling with the deceased in the auditorium moments after the evening's performance. Twenty minutes later, a gunshot shattered the silence. Authorities possess a blood-splattered glove but lack the murder weapon. Blake ponders the possibility of robbery, noting the empty safe, and intends to question Kapoor at his residence. He warns Fitzroy against seeking Kapoor's autograph, lest he forgets the man's suspect status.
At the police station, Blake learns that DS Phelps (Tim Chipping) has returned to duty prematurely. Though Blake assures him his presence is unnecessary, Phelps insists on a senior officer's guidance. Phelps inquiries about Eliza's presence, prompting her to reveal that Clarence Pettigrew has tasked her with settling unpaid accounts, including one pertaining to the Hawkins case. Blake dismisses it as an accounting matter, but Eliza persists in discussing the Barratt case, despite Blake's attempts to shoo her away.
Fitzroy enters, updating Eliza on Silas Skinner's status, and informs Blake that Kapoor awaits in interview room two. Kapoor, played with frustration by Nitin Ganatra, laments being hauled to the station and vehemently denies any involvement in Abraham's murder. He concedes that Abraham had criticized his wife's acting, who was part of the cast. Blake reveals the discovery of a matching glove in Kapoor's home and office, alongside an alleged murder revolver found within his premises. With a heavy heart, Blake concludes he has no choice but to charge Kapoor.
Returning to her office, Eliza is surprised to find Matilda Barratt (Lucy Liemann) awaiting her. Matilda confides that Kapoor had hired her a private investigator. She further unveils their year-long affair. Eliza acknowledges the uphill battle to prove Kapoor's innocence. Seeking clarification, she visits the prison where Mr. Fulton claims amnesia regarding Patrick Nash, leaving the mystery thicker than ever.Eliza gains access to Kapoor with the intention of uncovering details about his case that he had omitted. It transpires that after the grand finale performance last evening, Abraham had confided in Kapoor about a manuscript for a novel operetta hidden in his safe. However, the police reported it to be empty. Kapoor reveals that the manuscript was meant for Abraham's maiden solo venture, a magical tale revolving around an enchanted mirror. He admits to having had a heated discussion with Abraham as the latter was dissolving their partnership. Over time, Abraham had increasingly taken over most tasks, showcasing his unparalleled talent. Kapoor firmly believes that the thief of this manuscript is the murderer.
As Eliza exits the prison, she bumps into DS Phelps, who is spearheading the investigation into Abraham's murder. Phelps urges her to share any insights she might have, hinting that he has already interviewed Mrs. Barratt and the driver, who mentioned her visit to a female detective. But Eliza remains tight-lipped about her prison visit.
Meanwhile, Violet Kapoor (Anna Wilson-Jones) vents her frustration to Julius Barratt (David Sturzaker), Abraham's brother, over her husband's incarceration. Julius, unsympathetic, believes Kapoor deserves to be behind bars. During her visit with Eliza, Violet lambasts her husband for being selfish. Eliza assures her that she can prove Amil's innocence and secure his return home. Inquiring about the night of the murder, Violet recounts attending a soiree with fellow cast members. Upon her return, she found the police present and Amil already apprehended. She sighs that she would have made a splendid Shadow Queen and dismisses Julius as a talentless has-been, unaware that Eliza is privy to their brotherly relation.
When Eliza inquires about Abraham's new operetta, Violet feigns ignorance. Julius, intercepting Eliza outside, offers to enlighten her about Amil and his wife, portraying Amil as a snobbish individual despised by many, including his own spouse.
Julius further alleges that a profound animosity existed between Violet and Abraham, insisting that Violet's sole preoccupation is with garnering fame. That evening, Blake recites to his daughter Sophie (portrayed by Ruby Siddle), who inquiries about Eliza Scarlet's affinity for school. She notices Eliza's name inscribed within the pages of the book, prompting Blake to share tales of his days as a private detective.
As dawn breaks, Eliza approaches Blake, now aware that Kapoor has entrusted him with her case. Blake, however, declines to collaborate with her, steadfastly refusing to grant her access to the glove and revolver. Curiously, Blake inquires about Eliza's school days, to which she responds by revealing her attendance at a strict convent school where the nuns were harsh and her peers even harsher.
Eliza pays a visit to Mrs. Barratt, who learns of Abraham's latest operetta with feigned ignorance. She speculates that her husband might have uttered such claims out of malice. Meanwhile, Matilda confesses her confusion regarding the mirrors being covered and discloses that a man had been snapping photographs outside their residence that very night. She provides a detailed description of the individual, whom Blake recognizes as bearing a striking resemblance to Phelps.
Eliza seeks out Phelps, questioning his presence outside the Barratts' residence and threatening to expose his unauthorized involvement in the case to Blake. Charlie, overcome with emotion, begins to weep, lamenting the departure of his wife a couple of months prior and his subsequent descent into alcoholism. He lays the blame for his predicaments squarely on Blake, acknowledging that his superiors view him as a washed-up inspector long overdue for retirement. Charlie hints at an upcoming inspector position at Bow Street and mentions acquiring a camera from Scotland Yard, before plunging into self-deprecation. Eliza assures him of her discretion, reminding him that his prowess in his duties remains unchallenged. She urges him to set aside his self-pity and curb his whiskey consumption. Charlie then reveals that he was robbed, losing both the camera and photographic plates in the process.
Tragedy strikes as Julius Barratt is discovered stabbed to death. Fitzroy presents Blake with Eliza's business card, found on Julius's person, adding another layer of intrigue to the unfolding saga.
Blake confides in Eliza, sharing his suspicion that the same individual was responsible for the untimely deaths of Julius and Abraham Barratt. Curious about his inquiry into her educational institution, Blake reveals that his daughter is facing difficulties at school. Their conversation drifts to the poignant memory of Blake's late wife, who passed away three years prior. Eliza then unveils the mystery manuscript, potentially pilfered from a secure vault, and reveals Julius's speculation that Violet might have orchestrated Abraham's murder, framing Amil in the process.
Elsewhere, Violet captivates a small audience with her performance, unaware that Eliza and Blake are soon to confront her. She asserts her innocence, claiming to have spent the afternoon rehearsing at the pub. She recounts a chance encounter with Julius, who was also waiting to meet with their mutual producer, Maximillian Cinelli (Nikola Vujovic). According to Violet, that fleeting moment was the last she saw of Julius.
When Eliza and Blake seek Cinelli's insights, he paints a picture of Julius's inflated ego, believing himself on par with his talented brother. Cinelli, who harbors ambitions of making Eliza a star, divulges that Julius guarded a new operetta, "The Enchanted Mirror," within his violin case—a masterpiece about alchemy, witchcraft, and magic that Cinelli deems Julius's finest work. Mistaking their camaraderie for romance, Cinelli teases about Blake's apparent fondness for Eliza.
On Blake's suggestion, they venture to Julius's lodgings, where a startling discovery awaits: the violin case is conspicuously absent. Blake, revealing himself as one of seven siblings, accurately deduces Eliza's status as an only child. Meanwhile, Eliza stumbles upon the stolen camera equipment. Phelps joins them, and Eliza intercedes on Charlie's behalf to shield him from Blake's scrutiny.
Among the developed photographs, they uncover a compelling clue. Eliza asserts that Detective Phelps has led them one step closer to identifying the murderer. They proceed to Mrs. Barratt's residence, presenting her with the incriminating photo—a snapshot of her carrying Julius's violin case. She vehemently denies any knowledge of the manuscript.
Observing a mirror that wasn't present in her home during Eliza's previous visit, Eliza's instincts kick in. She uncovers a cleverly concealed compartment behind the mirror, revealing the elusive manuscript nestled within.
Mrs. Barratt vehemently denies any involvement in a murder, insisting on her innocence. Rumors circulate that she shied away from hiring reputable detective agencies, fearing it might exonerate Kapoor. Blake comments that Mrs. Barratt underestimated Eliza's prowess. During an interrogation session, Matilda confesses her desire to eliminate Amil upon discovering his infidelity. She envisions, once the storm subsides, unveiling her late husband's new operetta and ensuring its production in his honor. Furthermore, Matilda alleges witnessing Julius steal the manuscript right after slaying her spouse. Kapoor, now cleared of all charges, confides in Eliza his feelings for Matilda, suspecting his entanglement with her was a subconscious quest for vengeance against Abraham. That evening, Blake reads to his daughter, soothing her with words as Sophia laments that her peers refuse to acknowledge Eliza Scarlet's reality. Blake reassuringly affirms her existence.
The following day, Blake remunerates Eliza for her services in the Hawkins investigation. He inquiries about her availability that afternoon, hinting at a favor he wishes to ask. True to his word, Blake later brings Sophia to Eliza's office, introducing his daughter to the very embodiment of her disbelief. Eliza, with a warm smile, gives Sophia a guided tour of her workspace, proving to the young girl that Eliza Scarlet is indeed a figure of flesh and blood.
