The stranger inside / Lisa Unger.

Twelve-year-old Rain Winter narrowly escaped an abduction while walking to a friend's house. Her two best friends, Tess and Hank, were not as lucky. Tess never came home, and Hank was held in captivity before managing to escape. Their abductor was sent to prison but years later was released. Then someone delivered real justice - and killed him in cold blood. Now Rain is living the perfect suburban life, her dark childhood buried deep. She spends her days as a stay-at-home mum, having put aside her career as a hard-hitting journalist to care for her infant daughter. But when another brutal murderer who escaped justice is found dead, Rain is unexpectedly drawn into the case. Eerie similarities to the murder of her friends' abductor force Rain to revisit memories she's worked hard to leave behind. Is there a vigilante at work? Who is the next target? Why can't Rain just let it go?