Thunder on the Hill is a 1951 film directed by Douglas Sirk. The film is set in a convent where Sister Mary (played by Claudette Colbert) is presiding over a group of nuns. One night, a convicted murderess named Valerie Carns (played by Ann Blyth) is brought to the convent due to bad weather conditions.
Sister Mary is initially hesitant to accept Valerie into the convent, but as she spends more time with the young woman, she begins to believe that she may be innocent of the crime for which she was convicted. Sister Mary sets out to clear Valerie's name and find the true killer.
The investigation leads Sister Mary to a group of suspects within the nun's own community, including Valerie's volatile ex-boyfriend, a jealous and bitter nun, and a man who is in love with the convent's headmistress. As Sister Mary becomes more deeply involved in the case, she finds herself facing danger and risking her own safety to uncover the truth.
The film is noted for its strong performances by Colbert and Blyth, as well as its dark and moody atmosphere. It explores themes of faith, redemption, and the power of forgiveness, while also weaving a compelling mystery that keeps the audience on edge until the very end.