After a shocking data breach at the Finnish psychotherapy service Vastaamo, a nation’s secrets are being held to ransom by a faceless hacker. Jenny Kleeman traces the story.

After negotiations with Vastaamo fail, ransom_man begins publishing 100 patient records a day on the dark web. He posts a link to the records on popular sites like Reddit and Ylilauta, Finland’s version of 4chan.

He ends the post with one word. “Enjoy!” .

Finland is a nation in panic.

One victim, Meri-Tuuli, heads to the dark web to find out if her notes are among those published, and is appalled by what she sees.

But after a few days, the hacker does something that no one could have foreseen.

Written and presented by Jenny Kleeman. Producer: Sam Peach. Executive Producer: Georgia Catt. Sound Design: Sam Peach Original music composed, performed and produced by Echo Collective. A BBC Studios Production Commissioning Executive is Tracy Williams Commissioner: Dan Clarke