Miss Gem and the Missing Hat in Bloomington, MN

"You are our only hope! I have uncovered a dark secret ..."
Miss Gem receives an unexpected letter from Uganda. Aunt Agatha and her friend, Gertie, are in great danger. Miss Gem must find the missing hat and save them from the evil they fear. She sets off for Uganda on her dangerous quest with Milo Banks, the great mouse illusionist.