When an elderly woman is found dead in her home, newly fledged DC Kirsty Wilson is called to the scene. It appears that the woman had a mysterious visitor in the early hours of that morning - someone dressed as a carer, but with much darker intentions. It soon becomes obvious that this was not death by natural causes - it was murder. Before she can catch her breath, DC Wilson is thrown in at the deep end as another body turns up; this time the victim is a well-known drug dealer from Glasgow's mean streets, and there's no question that this was a brutal execution.

The two cases appear to have nothing in common, but when another vulnerable person is murdered in their sleep, the police realise that it's only a matter of time before the next victim emerges, and Detective Superintendent William Lorimer is called in to help DC Wilson investigate. This case is big and it's about to get more personal than either of them could have imagined...