After witnessing the brutal murder of his family, Jack Brooks (Trevor Matthews) is left with an unquenchable fury that he is constantly fighting to control.

Now working as a local plumber and struggling in a relationship with his girlfriend Eve (Rachel Skarsten), Jack's life has become a downward spiral. One night, Jack attempts to fix Professor Crowley's (Robert Englund) old, rusted pipes, but unknowingly awakens an ancient evil. Lured by this demonic power, Crowley discovers a monstrous black heart that quickly forces its way inside him. Possessed by the heart by beating in his chest, the Professor starts a slow, gruesome transformation. Only then does Jack realise he can't run away from his past, and quickly discovers the true purpose of his inner rage.