When his colleague Hilda Pierce is nearly killed in an attempted assassination, Foyle must re-examine her top-secret role.

When a young student is badly assaulted, Foyle wonders if the attack is racially motivated as the young man was the son of a wealthy and high profile Jewish businessman. Sam is determined to help a young boy in Adam's constituency.

Foyle, now working for British Intelligence, is drawn into the world of corrupt Nazi businessmen when London university professor William Knowles is found brutally murdered in a London park.