At the farthest edge of Federation space, an unmanned long-range sensor platform detects something strange—an anomaly siphoning energy from a dying star. It is artificial, vast, and utterly alien. Starfleet’s database holds no record of anything like it.

Meanwhile, Captain Órlaith Murphy is adjusting to her new command. With the USS Andromeda pulled from service, she now takes the reins of the USS Sentinel, succeeding its retiring captain, James Douglas. It’s a lateral move but a fresh start.

Hitching a ride aboard the Sojourner with her old friend, Captain Kirin Tarkin, Órlaith is accompanied by her brother, Ethan Talon, a Starfleet Intelligence operative whose presence is never without purpose. And this time, that purpose is clear—investigate the anomaly.

But as the Sentinel and Sojourner arrive in the system, they find more than a cosmic mystery: an ancient gateway, a desperate people, and a dying civilization on the brink of extinction. The Atlanteans, long thought to be nothing more than legend, have returned.

And they are not alone.

A rising force in their home galaxy, the Malosians, will stop at nothing to ensure Atlantis’s final chapter is one of annihilation.

Now, with history unraveling before them, Órlaith and her crew must decide—will the Federation observe? Or will they stand against the darkness threatening two galaxies?