Acting
William Lucas oozes sweaty desperation as the fixer Chandler.
Direction
Peter Graham Scott squeezes maximum dread into 62 minutes.
Writing
Sharp British dialogue, no wasted breath.

Director
Peter Graham Scott
Trivia, insights & behind the scenes
This was a 'quota quickie' — British films made fast and cheap to satisfy legal requirements for UK cinema content.
Billie Whitelaw later became Samuel Beckett's favorite actress; you can see her controlled intensity even here as the worried wife.