Delia Balmer, an agency nurse, met Sweeney, who confessed to killing his ex-girlfriend. He attacked her before evading capture. Balmer rebuilt her life to confront Sweeney seven years later after he was arrested for another murder.

Based on real events which saw two lighthouse keepers stranded for months at sea in a freak storm, the film tells a tale of death, madness and isolation; a desolate trip into the heart of human darkness.