A crime series
Martin Wyldeck as Carter Dickson's Sir Henry Merrivale investigates the case of And so to Murder dramatised by Paul Wheeler

In the summer of 1939 a film company is engaged in making a film about 'Spies at Sea.' But their efforts are bedevilled by a mysterious chain of 'accidents' which threaten to disrupt the whole project. Is this sabotage? The whole company becomes nervous and on edge. Into this tense atmosphere comes Monica Stanton, a young novelist engaged to work on another film scenario. Suddenly the 'accidents' take on a new and more personal character and lives are endangered. The great Sir Henry Merrivale, Head of Security Service, who is investigating the sabotage attempts, turns his attention to the new menace.