Through Amber Glass. Cold Meridian, #2

Five years after Gdansk, the past is no longer buried. It's operational. Charlie Kaplan left the FBI and disappeared into contract security work, trying to forget the conspiracy that cost him everything - and the woman he lost along the way. But when a cyber attack cripples Poland's new defense system and two consultants die under suspicious circumstances, the old networks stir. Charlie is pulled back to Gdansk, where Natasha Koroleva has arrived on her own investigation - and where the people who should be allies may be the ones running the operation.
As Polish intelligence scrambles to contain the breach, detective Katarzyna Werenska follows a trail of dead consultants that leads deeper into institutional rot than anyone anticipated. CIA officer Jackie Harper works her own angles from Warsaw, haunted by a name from her past she hoped would stay buried. And behind it all, a private intelligence firm called the Paralla Group is playing a game whose real objective has nothing to do with what anyone thinks they're fighting over.
In a world where the line between ally and adversary has dissolved, Charlie and Natasha must decide what they're willing to sacrifice - and who they're willing to become - to survive what's coming. Through Amber Glass is the second novel in the Cold Meridian series. It completes the story begun in The Gdansk Gambit - a story about what happens when the people who kept the secrets decide the secrets are worth more than the people.
For readers of John le Carré, Mick Herron, Charles Cumming, Paul Vidich, and Jason Matthews. A Cold Meridian novel.