A wave of sabotage has been sweeping England, taking lives and creating instability. Cmdr. Robert Brennan and Supt. Folland of the Special Branch and Major Elliott of MI5 are charged with putting an end to this internal terrorism.

High Treason

Laurence Naismith

Joan Hickson

Charles Lloyd Pack

Roy Boulting

Anthony Bushell

Pauline Winter

Dora Bryan

Anthony Nicholls

Frank Harvey

André Morell

Jean Anderson

Julian Amyes

Stuart Lindsell

Kenneth Griffith

Liam Redmond

Patric Doonan

Alfie Bass

Geoffrey Keen

John Harvey

Jack McNaughton

John Bailey

Mary Morris

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