Sigurdur Thordarson, known as Siggi, becomes a hacker at 12, exposing Icelandic bank corruption at 14. Branded the "teenage whistleblower," he joins WikiLeaks in 2010, mentored by Julian Assange. Siggi leaks globally, but clashes with Assange, prompting him to spy for the FBI at 18. This tale weaves paranoia, hacking, and friendship, portraying Siggi's turbulent journey from trust to betrayal, revealing a heart-wrenching coming-of-age narrative.