Thunder on the Hill was first announced as a Universal-International Pictures project in August 1947, with plans for Robert Siodmak to direct, Joseph Sistrom to produce and with Joan Fontaine and Burt Lancaster starring.

[5] Sister Mary Bonaventure is in charge of the hospital ward of a convent in the county of Norfolk, England.

A torrential rain closes nearby roads, causing Sergeant Melling of the police to bring condemned murderer Valerie Carns there.

Valerie still proclaims her innocence, but Jeffreys insists that she gave Jason a fatal overdose of his medicine.

A servant tells Sister Mary about the sadistic behaviour of Jason Carns and produces a love letter to him, clearly written by Isabel.