This mystery series starts off with a John Watson suffering from Ptsd and a Somatform disorder. He limps and Sherlock deduces that he doesn't actually have a limp, because there was a scene when the pair needed to chase a person and Watson wasn't limping at all. This show goes int the psyche of psycopaths, and exlpores how they think, a bit. Sherlock himself is a "high-functioning sociopath".