Chloe receives an unexpected offer; a television program uncovers a new lead in the abduction case of Adele and her twin sister Camille, causing the case to be reopened.

While the team struggles with Chloe's replacement, an over-confident criminologist with little actual experience and even less tact, it falls to Adele to unravel the disappearance of a young girl.

Adele's first investigation involves a killer in a horrible mask, popularized by a viral advertising campaign; the mask has been used in recent violent attacks, and the team will have to put on their best costumes to hunt the clown.

The team is called to investigate the death of an old woman who was hit by a car, poisoned and stabbed three times.