The Tromp Family

In late August 2016, the Tromp family of Silvan, Victoria—Mark, Jacoba, and their three adult children—suddenly fled their successful berry farm and thriving businesses without phones, wallets, or passports. Over the next week, their strange journey would stretch hundreds of miles across Australia, leaving behind a trail of abandoned cars, disoriented wanderings, and desperate pleas for help. What could drive a close-knit, hardworking family to believe they were being hunted? Was it paranoia, environmental toxins, or a rare psychological condition known as folie à deux—shared psychosis? The case gripped the nation of Australia, making headlines worldwide, and even now it leaves more questions than answers. Why did some family members resist the delusion while others collapsed under its weight? And most haunting of all—could something like this happen to any of us?

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