Lo strangolatore di Manhattan

Six tortured and strangled women tied to their bed. Another serial killer is wandering around Manhattan: according to the findings of Bowmann, a forensic expert, the killer always kills following the usual, macabre, ritual and it is the victims themselves who open the door to him. Nick Raider has an intuition, but to unmask the unsuspecting strangler he is forced to endanger the life of his beautiful colleague Mary Ford, who offers herself as the ideal bait.