Holmes investigates when a groundbreaking artificial intelligence software program is stolen, but he enlists Joan's help after he becomes more interested in disproving the computer's abilities than in tracking down the thief. Meanwhile, Joan confronts Sherlock about his motives when she learns he has contacted her boyfriend without her knowledge.

Holmes and Watson search for a thief who committed murder to steal a rare map. Meanwhile, Watson becomes concerned with Sherlock's escalating interference into Kitty's burgeoning personal life.