Enzo Macleod tackles one of France's most notorious unsolved cases in the fourth offering from the Sunday Times bestselling master of crime. Ile de Groix, France, is a frozen island. This tiny isle off the coast of Brittany is the scene of a murder left shrouded in mystery and grief. A frozen crime. Adam Killian's study has been left intact since his death, providing the perfect state for Enzo Macleod's forensic investigation. A frozen heart. Killian's daughter-in-law is still hoping; the first suspect is still hiding; and the treacherous island itself still has a revelation for Enzo.