"Maelstrom" (Destroyermen) by Taylor Anderson

• The Conflict: Lieutenant Commander Matthew Reddy and the crew of the World War II-era destroyer USS Walker continue their struggle in a bizarre, alternate Earth.
• The Alliances: Having allied with the human-like, peaceful Lemurians, Reddy's crew prepares for a massive, inevitable assault by the savage, reptilian Grik.
• The Threat: The captured Japanese battlecruiser Amagi falls under Grik control, commanded by a fanatical officer teetering on the edge of madness.
• The Stakes: Outnumbered and outgunned, Reddy and his crew scramble for new resources, technology, and allies to stave off total annihilation. 

• Series Position: Book 3 of 15 in the Destroyermen saga (preceded by Crusade and followed by Distant Thunders).
• Publisher: Roc Books / Ace Books

Very good condition