Join Jack Harvey and Emma Morgan in their next thrilling adventure. Loaded with non-stop action from the beginning to the very end.

**In 1944, a Nazi scientist named Klaus Richter created a cipher machine to replace the Enigma cipher. fifty years ahead of its time. Then it vanished along with Operation PO Box 1142. Now, seventy years later, someone will kill to keep it that way.**

CIA Agent Jensen Hunter thought his sister was safe. Dr. Marin Hart was a historian, not a spy, her world was dusty archives and academic conferences, not bullets and black ops. Then she disappeared while helping Jensen partner Adeline Chase decode a cache of classified WWII documents. Her last message mentioned something called “the Helix” and a seventy-year-old conspiracy that was supposed to stay buried.

Now Jensen has seventy-two hours to find her before she becomes another casualty of a secret too dangerous to expose. But when he tries to mobilize a rescue, his own government shuts him down. Stand down. Direct order. The investigation is being handled through another Agency. Channels that are moving too slowly, or not moving at all.

The people who took Marin aren’t amateurs. They’re the Spiral Group, a shadow organization that has operated in the darkness since 1945, protecting a secret that could topple governments and rewrite history. They’ve killed to protect it before. They’ll kill again. And no one can be trusted.

With his badge suspended and his access revoked, Jensen makes the only choice he can: he goes rogue. Adeline Chase, his CIA partner, risks everything to stand with him. Jack Harvey and Emma Morgan, civilians and treasure hunters that Jensen helped on a previous hunt looing for the Crown Jewels, drop everything when he calls in that debt. They owe him their lives. More than that, they trust him when no one else will.

It’s an unconventional team for an impossible mission: two suspended CIA operatives potentially burning their careers and two civilians with more experience decoding ancient puzzles than dodging bullets. But they’re united by something stronger than protocol or training, loyalty forged in fire.

Together, they’re going off the grid. No authorization. No backup. No safety net. Just a ticking clock and a trail of bodies leading into the heart of Europe’s darkest corners.

The Helix is real, a quantum cipher device decades ahead of its time, capable of unlocking an encrypted archive containing every crime, every conspiracy, every operation the Spiral Group has committed for seven decades, with the ability, if unlocked, to be able to control missile launches around the world. Marin is being held hostage to help them locate it. And now she’s bait in a trap designed to destroy anyone who gets too close to the truth.

To save her, this makeshift team will have to become what they’ve never been: ghosts operating in the shadows, hunted by the Spiral Group’s assassins, suspended by their own government, racing against a clock that’s already counting down to zero.

Two partners willing to sacrifice everything, and two treasure hunters who are all in over their heads. Seventy-two hours until Marin dies. And a secret that powerful men have murdered to protect for seventy years.

But some secrets are more dangerous than the people who keep them. And some conspiracies never really end.