Matt Reddy's old Asiatic Fleet destroyer USS Walker has been mysteriously transported to an alternate version of earth. Here WWII is no longer raging, and Reddy and his crew have been trying to find a new place for themselves in this strange new world. Now, along with the felinoid Lemurians and Imperial allies, they fight to keep the reptilian Grik, a race growing in supremacy, from reconquering the Lemurians' ancestral home on Madagascar.