Something is wrong with Sherlock Holmes. When Dr. Watson receives an urgent summons from his partner, Sherlock Holmes, requesting his aid, he fears the worst. What he finds, however, has him baffled... Has the great detective's mind finally collapsed beneath its own weight? Or is something more sinister at work in the sleepy town of Houndsford? With Sherlock incapacitated, John has no choice but to partner with the local police force and rely on instincts he doesn't quite trust to solve the case before it's too late.