On one tiny island, many hidden secrets - that Enzo Macleod must uncover to crack the fourth of France's most notorious unsolved murder cases. Ile de Groix, France. 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 - the perfect state for Enzo Macleod's forensic investigation. A Frozen Heart. Killian's widow is still hoping; the first suspect is still hiding; and the treacherous island itself still has a revelation for Enzo.