On the surface, Lara Chorley and Ruth Hull have nothing in common, other than their infatuation with Michael Vokey. Each is writing to a sadistic inmate, sharing her secrets, whispering her worst fears, craving his attention. DI Marnie Rome understands obsession. She's finding it hard to give up her own addiction to a dangerous man: her foster brother, Stephen Keele. She wasn't able to save her parents from Stephen. She lives with that guilt every...