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!

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?

• A Dog in the Coast Guard: Follow Buster, a brave yellow lab, as he leaves his family to join the real-life Dogs for Defense program and protect America’s shores.
• Home Front Espionage: While Buster is on duty, twins Charlie and Kate discover a secret coded message that reveals a shocking Nazi sabotage plot in their own town.
• High-Stakes Coded Messages: The twins must race against time to crack the German code, facing danger and proving that courage comes in all sizes.
• Based on Real History: Perfect for young readers who love action, animal stories, and learning about America during World War II.