The story unfolds on Day 1, with Ciara noticing Oliver watching her at the supermarket adjacent to her workplace. After she leaves, her smile fades as she realizes his intense gaze. When she gives him her number, he begins a digital investigation, only to find a recently created LinkedIn profile. Elliot, a close friend of Oliver's late father, checks in on him.
Days pass, and on Day 9, Shyla leaves Ciara a message, calling her Megan. Ciara has been ignoring their mother, who is seen crying over old family photos. Meanwhile, Ciara pushes Oliver to take her out for lunch, and this time, she's more forward. She notices his paranoid nature and his distrust of the corporate world, as he rants about global conspiracies. He brings up her lack of online presence, but she deflects by claiming her sister's identity was stolen. He doesn't seem to believe her excuse but lets it go.
He wants to see her place, and she tries to distract him by hooking up with him in an alley. However, it doesn't work, and she rushes home to clean up as much as she can.
The story shifts to the present day, where Karl spots Lee talking in an overly familiar way with a strange guy, whom she later claims is a witness. The case unfolds with a heater near the bathtub and bleach and oven cleaner used to dissolve the body. They believe an amateur googled how to get rid of the body. There's also a jacket from the dry cleaners on the sink, and they realize the crime scene is staged. Right then, the manager updates them that Apartment 11 is being rented out by Oliver Kennedy.
Oliver's ninth day at Ciara's doorstep is marked by an emotional journey as he uplifts her self-conscious spirit with jokes about ghosts. Ciara, plagued by loneliness from childhood, finds solace in the stories of her mom's possessed glass animal collection. When she retreats to the washroom, Oliver's curiosity takes him on a short-lived exploration.
That night, Elliot and Alison (the enigmatic woman in red) discuss Oliver's erratic behavior, with Alison demanding his removal, viewing him as a liability. However, Elliot is bound by his father's investment in their company, leaving Alison feeling unfairly used to cover up Oliver's true nature.
On the tenth day, Oliver's stay extends into the night as Ciara faked a landlord's eviction notice for a 3-week extermination. Oliver, despite her initial resistance, eventually "convinced" her to let him offer her the guest bedroom. He confesses his rapid falling for her, fearing the same fate as her former boyfriend, Tyler Merkow, whose heart she once broke. Her lighthearted response follows his departure, and she proceeds to research St. Ledger Ventures online.
Upon returning home, Oliver discovers a letter addressed to Oliver St. Ledger (his real name), only to find the envelope empty, causing him to panic.
In the present, Karl discovers that Oliver Kennedy was a figment of reality prior to December. He informs his chief of this revelation, who lectures him for allowing his hook-up to play with his gun. Frustrated with his job and colleagues, he runs the license plate of the "witness" Lee was talking to, further fueling his discontent.
During Oliver's therapy session with Dan, they discuss his potential suicide risk and his fear of being found in Boston. He reveals his superficial relationship with Ciara due to his fear of getting hurt. Dan points out his loneliness and inability to connect emotionally, suggesting a breakup before Oliver regrets his actions. Instead, he burns the envelope and hastily asks Ciara to move in immediately.
Ciara finally reaches out to her mother, who expresses frustration over her husband's debt and the bank's impending seizure of their home. Ciara promises to get her 10 grand, earning her mother's suspicion and labeling her a troublemaker.
Lee approaches Elliot in the aftermath of Alison's untimely death, defending Oliver's good nature but revealing a propofol sedative found in his bedroom. Elliot is about to share Oliver's request for a meeting when Karl confronts him about Oliver's last name. Lee tries to mediate but is met with Karl's persistence until Elliot threatens legal action.
Ciara moves in with Oliver, and they share intimate conversations about his dreams of becoming an astronaut before turning to architecture. He jokes about never wearing the NASA logo (the "meatball"), which she initially misunderstands. His disappointment is evident until she laughs and pretends ignorance, which he doesn't fully buy but drops the subject. After she feigns sleep, he injects himself with something and passes out, allowing her to try accessing his safe.
