Respectable schoolmaster returns from work on the eve of a wedding anniversary holiday to find a strange man dead in their bathroom and his wife missing.

A playboy tries to recruit a gang, who include an American who needs cash to satisfy his wife's expensive tastes, and an old time expert cracksman, to rob a foreign embassy's safe, but trouble starts when the plan begins to go wrong.

Loner Mark Lewis works at a film studio during the day and, at night, takes racy photographs of women. Also he's making a documentary on fear, which involves recording the reactions of victims as he murders them. He befriends Helen, the daughter of the family living in the apartment below his, and he tells her vaguely about the movie he is making.

Discharged by his employer, a private eye stays on a jewel theft case after a model with information for him is murdered.

Suave private investigator Norman Conquest intercepts a secret message and meets a beautiful but foreign blonde lady in room 605 of the Park Plaza hotel. But when Conquest wakes up in the room the next morning he is lying next to a dead body. With the mysterious blonde nowhere to be seen, Conquest soon becomes the police s number one suspect with Inspector Williams following his every move. In order to clear his name, Conquest enlists the help of Pixie Everard (Joy Shelton), but the going gets rough when he discovers that the murder is connected to a stash of stolen diamonds. As gun-happy gangs of communists and Nazi sympathizers turn up the heat, Conquest has to solve the murder whilst staying one step ahead of both the gangs and the police.