There are countless jubilant stories about the Healy on Facebook and YouTube. A small device that you can clip to your sweater or shirt and is said to promote your health through frequency therapy. You can treat any complaint with it: from sleep disorders and pain to depression and anxiety. And not only that, it can also make you rich, the sellers promise. But behind all the promises there appears to be a shadowy world hidden. A network of traffickers that takes advantage of thousands of vulnerable people.