A family of deep-cover Russian spies hiding in the heart of Europe. A Slovenian spycatcher with a daunting mission. After months of reporting, WSJ's Drew Hinshaw and Joe Parkinson unspool the story of the global hunt for Vladimir Putin's sleeper agents, and how it culminated in the biggest game of hostage diplomacy since the Cold War.

Further Reading:

-The Global Hunt for Putin’s ‘Sleeper Agents’

-Inside the Secret Negotiations to Free Evan Gershkovich

Further Listening:

-The Historic U.S.-Russia Prisoner Swap

-Inside Russia’s Spy Unit Targeting Americans

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