Lost Fleet: Beyond the Frontier: Invincible

An encounter with the alien enigmas confirms Geary's fears. Attacked without warning, he orders the fleet to jump star systems--only to enter the crosshairs of another hostile alien armada. Ignoring the First Fleet's peaceful communications, this species sends its ships into battle while it guards the exiting jump point with a fortress of incalculable power. Now Geary must find a way to reach the jump point without massive casualties--even though the enigmas could be waiting on the other side...