In the aftermath of Catherine’s suicide, Cardinal outwardly accepts the evidence that she took her own life. But when he starts to receive taunting cards blaming him for her death he begins to question the suicide. Back on duty, Cardinal and Delorme are called to a bloody cottage crime scene where at least two people have died, but there are no bodies to be found. What they don’t yet realize is that there is a living witness - a young woman named Sam Duchene. She escaped the killer, but has personal reasons to avoid talking to the police. With resources stretched thin as Delorme also works a string of ATM robberies, a hunch of Cardinal’s leads them to the two bodies strapped to a boat at the bottom of the lake. They have their victims now, but who are they – and who killed them?