Best friend Amos Binder and Dunc Culpepper are off on another adventure when Amos is mistaken for a government secret agent and given a top-secret assignment.
Amos's walking double is Prince Gustav of Moldavia, and the Prince asks Amos to switch places with him in a desperate attempt to uncover a traitor in his ranks.
Amos and Dunc are off on a Caribbean cruise when Amos wins a "Why I Love My Dog" contest, but before they know it, they wind up with more high seas adventure than they'd bargained for.