It's spring and fear hangs over west-end Montreal. For weeks, an unknown man has been entering people's homes at dusk and threatening them at gunpoint. He ties them up, robs them and then disappears. Between 2006 and 2009, he committed 13 home invasions, one murder, three attempted murders and one hostage taking; leaving dozens of traumatized families in his wake. Using unusual investigative techniques, the police spend ten years tracking him down. Under the close scrutiny of journalist Patrick Lagacé, the series sheds light on many facets of the story that have remained in the shadows.