A sweltering heat wave on a Bank Holiday causes a mass exodus from London, and American Sandy Marshall is left virtually alone in her apartment block when her husband is called away on a business trip. Sandy is confined to a wheelchair following a car accident, and inadvertently lets a killer posing as a delivery man into the building. Remembering that several girls have been found strangled of late, she suddenly realises her mistake and begins to fear for her safety. With the phone cut off and no-one to turn to, she attempts to escape the building but discovers that there is someone still at home downstairs. She invites the affable young man up to her room, but soon begins to suspect that she may have in fact made a terrible misjudgement.
WRITTEN BY: Brian Clemens
DIRECTED BY: James Ormerod
PRODUCED BY: Ian Fordyce
MAIN CAST: Carroll Baker (Sandy Marshall), T P McKenna (Frampton), Maurice Kaufmann (Derek Marshall), Ronald Lacey (Bartlett), Max Mason (Tom Packer), Ian Gelder (Small), Brenda Cavendish (Betty Tyler), Martin Benson (Spiros Lemke), Anita Sharp-Bolster (Mrs Bluther), Andrea Allan (Janet Cunningham)