Jan Marsalek’s face is on wanted posters all over Germany, after the financial tech firm he ran evaporated in a $2.5 billion fraud case in 2020. Now, a group of journalists, including GBH’s Frontline, is working with investigator Christo Grozev to prove Marsalek is in Moscow, and has been working with Russian intelligence services for years. Grozev describes the ongoing investigation to Host Carolyn Beeler.