Episode 6 of "Watson" commences with Stephens returning to the sanctity of his home, where he engages in a virtual encounter with Porsche, a camgirl whose interest in him, though shallow, oddly provides him solace. Yet, he notices her profuse sweating, prompting him to suspect she might be suffering from a worsening urinary tract infection (UTI). His suspicions prove all too true when she collapses later that night. Offering to lend a helping hand, Stephens wonders if the clinic, amidst their pressing matters, can accommodate another client.
Back at the lab, Shinwell announced they are embarking on Project Zero, a mission necessitating the reduction of their client list to zero by sunset. The workspace buzzes with camaraderie tinged with playful ribbing, particularly Ingrid's snarky remarks aimed at Lubbock, who relentlessly teases her about her upcoming birthday.
Stephens approaches Watson with his genuine concern for Porsche, apprehensive about the potential ridicule from his peers. However, the gravity of the situation demands their immediate intervention. They must locate her swiftly, lest she succumbs to her illness. They decide to employ detective work worthy of Sherlock Holmes, piecing together clues from her cam feed to track her down.
Amidst their investigation, the spotlight shifts to Ingrid's past, specifically the mystery shrouding her return. As they decipher her mailing address, Stephens, Adam, and Watson set off to Lawrenceville. The real-time glimpses of Porsche paint a dire picture, her condition deteriorating rapidly. They calculate they have mere hours—four, to be precise—before she could slip away. Time is a precious commodity they cannot afford to waste.
Watson offers words of encouragement to Stephens, who is visibly embarrassed by his camgirl escapade. But they strike gold when they notice Brutus, Porsche's dog, momentarily knocking over the camera. This fortuitous mishap allows them to utilize a magnifying glass on some envelopes, revealing her new alias: Kathryn Patricio.
The group arrives at Patricio’s apartment at the eleventh hour, hastily escorting Annie Wilson—a name uncovered alongside her connection to a rabbit farm in New Mexico—to the lab. For now, these fragments of information suffice as clues in their quest to find her.
While Stephens keeps Porsche company, Watson confesses his own guilt and grapples with the loss of his mentor. Though not identical, he uses this shared pain as a catalyst to urge Stephens to cease blaming himself for the unfolding events.
It transpires that Annie, while in New Mexico, was bitten by a rabbit believed to be carrying the Black Death, or perhaps a mutated strain thereof. With a treatment protocol now confirmed, Stephens diligently administers the cure to her.
Elsewhere, Lubbock, after pestering Ingrid throughout the episode about her birthday wishes, presents her with a cake. Ingrid promptly rejects it, figuratively hurling it back in his face. She accuses him of attempting to win her favor with sweet gestures, ultimately seeking control. She scoffs, urging Lubbock to sort out his own life before trying to mend hers. Disheartened, she returns home and decides to end her relationship.
Concurrently, Shinwell confronts Watson, elucidating that Sherlock's suicide stemmed from his vanity, absolving Watson of any responsibility. However, it remains ambiguous whether Watson has swapped the pills as instructed by Moriarty's henchmen.
