A former San Francisco police detective suffering from an extreme case of obsessive-compulsive disorder is called in to investigate an apparent assassination attempt of a mayoral candidate in which one of his bodyguards is killed.

A judge is murdered while placing a 911 call, but before she dies she names her attacker - notorious criminal Dale Biederbeck. The problem is, "Dale the Whale" is over 800 pounds and hasn't left his bed in years.