Sur les traces d'un tueur

The year 1982 was marked by several sordid murders and disappearances of young women in Montreal. What happened to Suzanne Blanchard, Diane Bélanger, Sylvie Trudel and Murielle Guay, all killed within days of each other? The team is busy finding answers by revisiting the theories of the time and discovering new avenues.

In 1974, Johanne Frégeau, 18, was killed in front of her friend, who offers us a moving testimony. This unsolved murder could be the first of a notorious serial killer. In 1975, the villainous murder of Diane Thibeault left a mark in the annals and continues to raise questions. The team is examining the matter in depth.

The team continues looking into the Johanne Frégeau case. The discovery of a witness reveals new information. In order to get answers for the families, an attempt is made to contact a serial killer. The mysterious file of Chantal Rochon, 17, found in a small wooded area in Blainville in 1988, is analyzed.

The mystery remains in the Suzanne Blanchard case. The denunciation letter received in 2010 is analyzed in an attempt to find the author. The team returns to the Diane Thibeault case with new information. The secret of Diane Bélanger's ID photo has finally been revealed, shedding new light on her disappearance in 1982.

In this last episode, the team tries to get in touch with 2 possible suspects in the ongoing cases. The team meets with Diane Thibeault's son to share the results of their research into his mother's predicament. The families and relatives of the victims gather in a park to pay their respects in memory of the missing.