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Watson and the fellows help Laila's son Micah, who was injured in a car accident while pursuing his crush.
Watson and the fellows are taken hostage by a man with a bomb strapped to his chest who is desperate to find a cure for his 9-year-old daughter's illness.
Watson's biohacker friend Hobie returns when he rushes his new girlfriend to the Holmes Clinic after they partake in a gene-editing experiment that goes wrong; Watson becomes suspicious of Sherlock.
With his eyes fixed on the future, Watson faces an unexpected twist when Sherlock Holmes, who was presumed dead, resurfaces, forcing him to confront a buried secret from his past—one that lies hidden within his own body.