A Roman Catholic priest defies a Mexican bandit whose gang kills villagers in alphabetical order.

Fearing her husband could become a killer, a woman seeks a psychiatrist's help.

A government team researching cures for plague find their results put on the Official Secrets list. One of their number is so incensed by this that he lets the maimed and jealous companion of a female colleague draw him into what, technically, could be a treasonable act.
Tony Britton ... Dr. Robert Marriott
Virginia Maskell ... Dr. Lucy Byrne
Ian Bannen ... Alan Andrews
Kenneth Griffith ... Dr Shole
Peter Cushing ... Professor Sewell
Thorley Walters ... Special Agent Prince
Donald Pleasence ... Parsons, alias Bill Brown
Spike Milligan ... Arthur, lab orderly
Raymond Huntley ... Sir George Gatting, the Minister of Defense
Sam Kydd ... Slater
Anthony Booth ... Parkin
Basil Dignam ... Dr.Childs
Brian Oulton ... Director
Robert Bruce ... Levers
John Payne ... Iverson