earing only a hospital gown Felix Underwood returns to the village and says 'Murder' before collapsing, apparently dead. At his funeral however the 'corpse' comes back to life but with a loss of memory. He was a patient at Danvers Retreat, a psychiatric hospital for service personnel, which Father Brown visits, along with new Inspector Sullivan, discovering a body hidden in a well. Father Brown gets himself admitted to Danvers Retreat in order to get close to a young woman who supplies clues in biblical texts and to solve both the murder and the mystery surrounding young patient Jeremy.

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