Steve McQueen co-writes and directs this starkly honest portrait of a man struggling with sex addiction. Michael Fassbender stars as Brandon, a lonely 30-something New York bachelor who lives a carefully-concealed second life revolving around excessive levels of casual sex, prostitutes, pornography and masturbation. When his depressive sister, Sissy (Carey Mulligan), arrives unannounced to stay with him, seeking refuge from her own troubles, Brandon's life starts to unravel as his dark and shameful secrets are revealed.