Twin siblings give their dog to the Coast Guard during WWII only to discover a German threat in their hometown. The sixth book in the action-packed Soldier Dogs series that's perfect for fans of Hero and Max!

Comes with a pull-out collectible poster and map!

When they hear about the Dogs for Defense program, twins Charlie and Kate know their yellow lab Buster would be a perfect soldier dog. So they enlist Buster in the Coast Guard, where he works alongside Army horseback patrols to protect US shores from German U-boat attacks.

Back home, Charlie and Kate discover a threat of their own?a coded message about a Nazi sabotage plan! With danger on every side, can Charlie, Kate, and Buster defend US shores from the Axis Powers?

Marcus Sutter is a former military brat who collects model planes and ships from the WWII era. He lives on a ranch in the Midwest with his family and their three-legged mutt, Mike.