Thunder on the Hill (1951)

When there is a flooding in Norfolk, many locals move with pets and animals to the local convent and hospital that is isolated from the mainland when the dam collapses. Sister Mary Bonaventure coordinates the arrangement with the Mother Superior to lodge and feed the unsheltered people.

Soon she meets Valerie Carns, who was convicted for fratricide and condemned to the gallows on the next day, but is trapped in the convent with Sgt Melling. Her brother Jason died of overdose and she was responsible to give his medicine to him. Sister Mary, who is the nurse of Dr. Edward Jeffreys, talks to Valerie and is convinced that she is innocent. Dr. Jeffreys' testimony in court was crucial for her sentence. His wife Isabel Jeffreys is very sick in the hospital. Valerie asks Sister Mary to bring her fiancé Sidney Kingham to the convent, and she does to Norfolk by boat with the employee Willie to bring him to stay with Valerie in her last hours. Willie comments a letter that he kept with him and Sister Mary tries to find evidences in old newspaper that may prove Valerie's innocence.