A nightmare jolts Debs awake. She leaves the kids tucked up in their beds and goes downstairs. There's a man in her kitchen, holding a knife. But it's not an intruder. This is her husband Marc, the father of her children. Once, their differences were what drew them together. Him, the ex-army officer from a good family. Her, the fitness instructor who grew up over a pub. But now they grate to the point of drawing blood. Marc screams in his sleep. And Debs hardly knows the person she's become, or why she lets him hurt her. Neither of them is completely innocent. Neither is totally guilty. Marc is taller, stronger, and more vicious, haunted by a war he can't forget. But he has no idea what Debs is capable of when her children's lives are at stake...