Six members of a media company go on a weekend business retreat at an isolated lodge in the woods. When one of the members goes missing, they discover that the lodge was formerly a private mental institution that had been shut down after allegations of devious misconduct. One by one, they fall victim to the dark secrets buried at the lodge.

Convinced romance is dead, a heart-broken man turns to his best-friend who plans an unorthodox 'Mantervention'.