Fallen by Karin Slaughter

Faith Mitchell is a policewoman, following in her mother's footsteps. She is late picking up her baby, Emma, and when she arrives there is blood on the door, blood in the kitchen, a body in the laundry room. Emma is screaming. She calls for backup, then enters the house. What turns into her mother's kidnapping puts Faith and her partner, Will Trent, in the middle of chaos, murder, and revenge. Slaughter writes a twisted tale of good and bad, the heroine having to face problems from the past, the hero coming to terms with his past and justice for all, maybe. A good read.