Stranger Child: 4 (DCI Tom Douglas)

One dark secret. One act of revenge. When Emma Joseph met her husband, David, he was a man shattered by grief. His first wife had been killed outright when her car veered off the road. Just as tragically, their six-year-old daughter mysteriously vanished from the scene of the accident. Now, six years later, Emma believes the painful years are behind them. She and David have built a new life together and have a beautiful baby son, Ollie.