A promise made to a dead man, leads Enzo Macleod to Ile de Groix, France. This tiny isle off the coast of Brittany was the scene of a murder left shrouded in mystery and grief. Adam Killian's study has lain untouched for more than 20 years- the perfect state for forensic investigation- but an attractive widow, an acquitted prime suspect and a collection of impenetrable messages, make this one of Enzo's most difficult cases.