With the Simister Gang out to get him, America is too hot for Judge Lobbett. He takes refuge on an island on the Suffolk coast, but even there life is far from peaceful. Blackmail, abduction
and sudden death bring matters to a climax. It is Albert Campion, with the unorthodox help of his man Lugg, who masterminds the defence of Mystery Mile and uncovers the true face of Simister.
The island is based on Mersea Island in Essex.