Criminal profiler Kris Illingsworth helps Debi unravel Derrance Stevenson's double life, while three crucial witnesses point to other being involved in his murder.

Tensions rise when David confronts a key witness. Debi looks into the long-rumoured connection between Derrance Stevenson and the Family Murders.

Debi learns about what happened to the first-known murder victim of The Family and the amount of lives that were destroyed.

Debi tries to track down someone who has fled the country to Italy, while Kris Illingsworth restages the crime scene.