This is the third time Portland police have discovered the monstrously mutilated bodies of schoolgirls on the river bank. A maniac has appeared in the city, there is no doubt about it. The case has been entrusted to the most experienced local police detective, Archie Sheridan. However, he cannot make any progress in the investigation... Archie forced to ask for help from Gretten Lowell, a psychologist and ruthless killer serving a life sentence, whose “communication” once almost cost him his life. Gretten agrees to help Sheridan catch the criminal. However, for her consultation she demands a special fee, inviting the detective to play a game with her a sophisticated psychological game...