Song of Songs(2005)

Devoutly religious Ruth returns from Israel to care for her dying mother, but when she tries to bring her estranged brother David back into the fold, in accordance with her mother's wishes, the result is a startling journey into the darkest realms of sexual obsession: a forbidden game under the guise of religious law. Dark, ambiguous and distinctly adult, this study of belief and desire, set in the cloistered world of London's Orthodox Jewish community, thoughtfully explores the links between faith and violence, denial and longing.

Official site