American scientist Dr. Frank Smith is brought to Britain to help the C.I.A. There is a defecting East block scientist they want him to debrief. The commies are less than amused and set Dr. Smith up for a murder.

Anna Neagle
as Mary Randall, Q.C.

Anthony Quayle
as Dr. Frank Smith

Zsa Zsa Gabor
as Eve Trent

Katherine Kath
as Yvonne Delbeau

Dora Bryan
as Telephonist

Patrick Allen
as Jim Kennedy

Hugh McDermott
as Bernie

Leonard Sachs
as Professor Horvard

Edward Lexy
as Hobbs

John Paul
as John Castle