Lord Charles Sheridan and his clever American wife, Kate, have been summoned by the king to clear the name of a prince who's been living secretly at Glamis under an assumed name, while keeping his true identity secret.

Two apparently accidental deaths at the Marconi telegraph station. The drowning of a local girl. Two cases that involve Charles, Lord Sheridan, and his wife, Kate, in foreign espionage, malicious intrigue, and inexplicable messages sent out of the blue.