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Peter (Toby Stephens) and Michael (Richard Coyle) are best friends who share a dark past. Then Kate (Keeley Hawes, Tipping the Velvet) arrives on the scene and unwittingly comes between the pair when she falls in love with Michael. But why is Peter so furious that Michael has found his soul mate? When the mysterious events of the past start to impinge on the present, Kate finds herself confronting the terrifying secret that binds Peter and Michael's obsessive, destructive relationship.