The stranger who saved your life isn't the person she seems - but you've already told her your darkest secrets... One hot, humid night in London, Cara is caught up in a wave of terror and chaos - until a hand reaches out and pulls her to safety. Taking refuge with her unlikely rescuer, Cara shares more of herself with Amy than she ever has with anyone, including her husband. Secrets that were never meant to see the light of day. After they emerge, Cara attempts to put the incident behind her. But cracks begin to appear in her life and marriage, and she receives anonymous threats. As Cara's life starts to skid out of control, Amy reappears. Amy is the only person Cara can turn to, who knows her hidden side. Amy saved her life that night. But what if the biggest threat to Cara is the stranger she's invited into her home?