Every police precinct has a case that defies explanation and evades solution. Recently promoted Captain Yohan Vivès faces such an elusive mystery when he investigates the gruesome murder of a young woman named Clara in the French town of Grenoble. It is clear that the attack was premeditated, and the violent nature of the crime suggests revenge. All the evidence points towards a scorned ex-lover, but which one? Vivès' team methodically digs through the details of Clara's life, uncovering her secrets while striving to weed out the killer.