Some hackers steal your credit card. Others might snoop through your Web history. But what if your deepest, darkest secrets — the ones you only tell your therapist — were suddenly on the Internet, for anyone to read? When one of Finland's largest psychotherapy companies was breached, the stakes were so high that police worked around the clock hunting for "Ransom Man," the extortionist behind the cruelest hack in history. BBC cybercrime correspondent Joe Tidy recounts the story and covers much more in his new book "CTRL+ALT+CHAOS: How Teenage Hackers Hijack the Internet." Visit https://darknetdiaries.com/episode/159/ for a list of sources, full transcripts, and to listen to all episodes.