The Mystery of the Strange Messages - 13

Mr. Goon can't understand it. Messages keep coming to him, popping up all over the place. But who is sending them? Mr. Goon thinks it must be Fatty playing a trick on him, and that's how the Five Find-Outers find out about the strange messages. With the help of Ern, Mr. Goon's nephew, the Find-Outers dive into another remarkable mystery.