It’s the most important mission of his life—because it’s the most personal.

Once a key player in a clandestine CIA squad, Sam Callahan thought he had finally found a safe, normal life as a rookie lawyer in DC with the woman he loves. But when called to a covert intelligence mission in the heart of Russia, he can’t refuse risking it all once more. This time, he’d be joining his estranged father, the Lion, a deep-cover agent Sam never even knew existed.

When the operation goes wrong and his team is ambushed, Sam fears a setup. At least he escaped with his life. And so did his father. But why? With a target on his back, he must hunt down the truth behind the betrayal in Moscow—and find the Lion again.

Now, crisscrossing Europe under the cover of shadow, Sam is about to come face-to-face with his past—and it’s never looked so dangerous.