Susan Wright walked into a doctor's surgery and gunned down two members of staff in cold blood, then waited for the police to arrest her. Later that day a lawyer, Beth Powell, is assigned to defend her. Susan won't talk to anyone, even to Beth – until both women realise that twenty-nine years earlier they had been childhood friends. Talking about their troubled families and those happy summers they spent together as children rekindles Susan and Beth's friendship. And as the evidence against Susan mounts up, both women share their traumatic secrets about what sent them down such different paths in life. Their friendship grows stronger, but for one of them, there can be no happy ending ...