Episode 4 of the third season of Professor T commences with a captivating scene: a woman elegantly strides into a mansion of grandeur, sheds her attire, dives into its shimmering pool, only to surface moments later, wracked with nausea, before collapsing onto the tiles in a lifeless heap. The narrative shifts seamlessly, revealing Tempest in the company of his confidante and therapist, Dr. Helena, where they briefly touch upon Christina's decision to depart from the police force. Helena divulges that the police department yearns for Tempest's return, beseeching his expertise in unraveling a string of unsolved cases.
Little does he know, his own world is about to unravel as well. At the university, a stark revelation awaits him – his tenure as a faculty member has been abruptly terminated.
As the episode deepens, Lisa and Winter arrive at the grim scene, where the forensic team concludes the death to be an unfortunate accident. Yet, amidst the investigation, Lisa's keen eye catches a fleeting glimpse of a woman in a striking red tracksuit, who vanishes into thin air. Later, this enigmatic figure materializes in Lisa's office, introducing herself as DCI Maya Goswami, her new supervisor. Photographs uncovered on the deceased woman's phone hint at a profound bond shared between the victim and Goswami.
Taking charge, Maya uncovers a chilling revelation: four mysterious deaths have occurred since dawn, each whispering of a sinister connection. She posits the existence of a serial killer, employing toxins and poisons as their deadly weapons.
In the aftermath of the briefing, Maya imposes a strict edict: no fraternization among team members, and one of them must seek a transfer. Undeterred, Lisa sets out to prove her mettle, enlisting Tempest's assistance in cracking the case. Together, Lisa and Winter delve into the life of Hal Howard, uncovering from a chocolate factory worker that Hal's relentless quarrels with his brother, Edwyn, often centered around wage cuts.
Meanwhile, Tempest's instincts lead him to a suspect, Fredy Walters, who finds himself in the hot seat. At the police station, Maya issues a stern directive, forbidding her team from consulting Tempest. Under interrogation, Fredy confesses to peddling drugs among factory employees but steadfastly denies any involvement in Hal's demise. Lisa, unrelenting, pursues another lead, interviewing Dennis – Hal's former business partner, who fled the company amidst escalating costs and mounting pressures.
The stage is set for a thrilling chase, as the intricate web of deceit and murder begins to unravel, driven by the unwavering determination of Lisa, Tempest, and their unlikely ally, DCI Maya Goswami.
It later transpired that a chilling commonality bound all the victims: they had all indulged in Red Caps chocolate, Howard's chocolate empire's flagship product, mere moments before their untimely demise. Under the weight of the investigation, Fredy's resolve crumbled, spilling the beans that Dennis had procured ethylene glycol for him, instructing him to lace it into the chocolate batches. To ensure Fredy's silence, Dennis had abducted his beloved daughter, dangling her life as a gruesome bargaining chip.
Lisa and Goswami embarked on a perilous mission to apprehend Dennis, but he proved to be a slippery customer, slipping through their grasp. Tempest's astute deduction steered them towards Dennis' sanctuary of success—his secluded holiday cottage, where he sought refuge. Dennis, though, pleaded innocence, claiming no intention to harm, but his attempts at another escape were thwarted by Goswami's swift intervention.
As the dust settled after Dennis' arrest, Lisa disclosed that it was Tempest's shrewd counsel that had led them to the cottage. However, Goswami's stern words signaled the end of Tempest's involvement, casting a shadow over his future.
Tragedy struck again when Anthony Dixon's wife succumbed to the same fate, consuming the tainted chocolates. Tempest's instincts ignited, sensing a deeper conspiracy. He zeroed in on Dixon as a prime suspect, suspecting him of a sinister ploy to deflect blame onto the poisoned sweets.
His suspicions solidified when Dixon, in a moment of confession, admitted to administering the lethal treat to his wife. Yet, Dixon's justification echoed with a heartbreaking rationale: his wife's relentless battle with motor neuron disease had rendered her life a living hell, and he saw it as a mercy to end her suffering. This revelation painted a complex portrait of right and wrong, where the ends, however noble, did not justify the means.
