Sandrine Jourdan was a vivacious mother of three from the small town of Caboolture, Queensland—until she mysteriously vanished in 2012. Police quickly labeled her disappearance a suicide but her family believe something much more sinister is at play. Liz Hayes' panel of experts examine mysterious letters sent to Sandrine's family by an unknown person, and evidence that her social media account is still being accessed. Under Investigation has spoken to neighbours who heard a scream and gunshots near the area Sandrine vanished from—raising serious doubts about the official narrative.

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