The stories told in this program are based on investigations and strange events and unexplained phenomena that most often took place in the United States of America but also in Australia. Pierre Bellemare puts his talent as a storyteller at the service of these strange stories in order to create suspense and mystery. The stories told are illustrated by reconstructions taken from the original American format Unsolved Mysteries (1987-2002) presented by Robert Stack (over 553 episodes).