For five men, the opportunity to share a penthouse in the city -- in which to carry on extramarital affairs -- is a dream come true, until the dead body of an unknown woman turns up. Realizing that her killer must be one of their group, the men are gripped by paranoia as each one suspects another. Friendships are tested, loyalties are questioned, and marriages crumble while fear and suspicion run rampant.

Five close friends, all of them married, share a loft to meet their mistresses. One day they find the body of a young woman in the loft. Since there are only five keys to the loft, the five men begin to suspect each other of murder.