Captain Matt Reddy and the crew of the USS Walker have been fighting for their lives ever since their ship was swept from the Pacific to another world and they became embroiled in a deadly conflict between their Lemurian allies and the ravening Grik.

But things are about to get worse. With Reddy's family and allies held prisoner by mad General Kurokawa, the mysterious League and evil Dominion plotting schemes of their own, and the Grik trying to build their swarm and concentrate power, Reddy faces danger on all sides.

With the mighty League battleship Savoie at his command, Kurokawa plots a terrible vengeance against Reddy and his tiny, battered destroyer. The stage is set for a devastating cataclysm, and Reddy and his allies will have to risk everything to protect what they hold dear.