Six months pregnant Martine Bernard's family reports her missing, days later, her father vanishes as well. When officers interview Martine's husband, Cassandritz Blanc, they find a calculating psychopath willing to do anything to cover his tracks.

Every parent's worst nightmare is the possibility that their child has the same evil traits as the most heinous murderers. In this episode, specialists look at the early warning indicators in psychopathic killers arrested as teenagers and young adults.