May’s excellent fourth Enzo McLeod mystery (after 2008’s Blacklight Blue
) takes the Scottish forensics wizard, who impulsively bet his daughter’s boyfriend he could solve seven cold cases, to the Ile de Groix off the coast of Brittany, where he may finally meet his Waterloo. The quaint island is the site of the notorious 1990 slaying of tropical disease specialist and entomologist Adam Killian in his study. For two decades the crime scene—and the cryptic hints Killian supposedly left to identify his killer—have remained as undisturbed as an insect frozen in amber. Can Macleod, distracted by personal dramas that involve his sometime lover, Charlotte, and a menacing stalker, decipher the message—and stay in one piece? With its intricate plot, compelling characters, and bombshell denouement, this unsettling Enzo Files installment is a must-read. (Mar.)
