It was her / Mark Hill.

Twenty years ago, Tatia was adopted into a well-off home where she seemed happy, settled. Then the youngest boy in the family dies in an accident, and she gets the blame. Tatia is cast out, away from her remaining adopted siblings Joel and Poppy. Now she yearns for a home to call her own. So when she see families going on holiday, leaving their beautiful homes empty, there seems no harm in living their lives while they are gone. But somehow, people keep ending up dead. As bodies start to appear in supposedly safe neighbourhoods, DI Ray Drake and DS Flick Crowley race to find the thinnest of links between the victims. But Drake's secret past is threatening to destroy everything.