"Nate the Great and his trusty dog Sludge, have a tricky case to solve. Nate's friend Rosamond has started a future-telling business, but her money box is missing. Sludge and Nate visit Claude, who helped Rosamond set up her business, and Finley, who collects boxes for his rat. They can't seem to help. It looks like the only way to clean up this case is to get down and dirty in the dumps!

Nate the Great and his dog Sludge look for Annie's housekey which has mysteriously disappeared.

Nate always depends on his dog Sludge to help him solve all his cases, but Sludge is missing and Nate must rely on his own skills to find him.