When his priceless Blue Cross is targeted by the infamous criminal Flambeau, Father Brown takes the initiative to try and save his soul. But is he walking into a trap?

The mysterious disappearance of an old friend sends Father Brown and Sid on a quest to find the mythical Lannington Rosary. However can an old adversary, back from the dead, be trusted to help?

Father Brown is told that Bishop Talbot will be assassinated.