A woman who begins laughing hysterically when her boyfriend Paul proposes to her falls down a staircase after he shakes her. Matt Matthews, a supposed friend, photographs Paul as he carries the body outside and convinces him that the police will never believe his version of what happened and that he should put the body into a trunk and dump it in the lake. Matthews then immediately proceeds to blackmail Paul. Tony Blake is involved when Paul's son, Danny, finds out what happens and attempts to help his father, only to be captured by the villains. Blake's investigation leads him to a rendezvous at an ornate, Gothic style inn where he must find his informant and outwit the blackmailers.