The investigator on Heather’s case was lauded in his field, but he’d run into one frustrating problem when dealing with her: a lack of female criminals to look at for precedent. Scrolling through the database, he soon realized he’d run out of options. He’d avoided it at all costs, but now there was nowhere left to turn. He had to delve back into the one case that had always kept him up at night: the chilling story of the Papin sisters.