Boris Turganev (Murray) is a Russian scientist who has absconded from a Communist prison in an attempt to achieve a better life working for the British. As Boris struggles to make his superiors believe he is there to work and not to spy for the Russians, an office romance blossoms that could put his mission in jeopardy.

Stephen Murray
as Boris Turganev

June Thorburn
as Leila

Alan Wheatley
as Paul Skelton

John Carson
as Richard Colman

John Bown
as John Baxter

Jack Watson
as Captain Foster

Ernest Clark
as Dr. Pembury

Peter Gilmore
as Tom Masters

Marne Maitland
as Dr. Asafu

Ellen Pollock
as Dr. Morrell