Private investigator August Riordan returns to San Francisco to avenge the death of his friend and one-time partner, Chris Duckworth. Duckworth has taken over Riordan's old business, his old office and even his old apartment, and Riordan suspects Duckworth's death is linked to the missing person case he was working when he died. An alluring young woman named Angelina hired Duckworth to look for her half-sister, but what Riordan finds instead...