After Constable Nick of Aidensfield and Heartbeat fame's retirement, he helped create a small private police force of monk-constables serving Maddleskirk Abbey and its adjoining college. The body of an unknown man is discovered in a huge stone coffin in the crypt and Nick and DCS 'Nabber' Napier of the local constabulary welcome the assistance of the monk-constables. With help from retired Sgt Oscar Blaketon and ex-PC Alf Ventress, plus some input from Claude Jeremiah Greengrass, Nick's experience is put to the test as a killer stalks the hushed corridors of Maddleskirk Abbey.
When a woman confesses to Father Will, one of the monk-constables at Maddleskirk Abbey, that she has committed murder, he can do nothing but absolve her from sin. The seal of confession is absolute but when a body is found in the nearby woodland, his moral dilemma grows. As the enquiry progresses and the clues confirm his fears that it is a murder case, Father Will must still not reveal his knowledge. Detective Chief Superintendent 'Nabber' Napier and his team have a murder to solve. The search for the killer intensifies. Questions need to be answered and confessions must be made before anybody else gets hurt.