The Mysterious Message is one of the books from the Geronimo Stilton series, which follows the adventures of the titular character, a mouse who works as the editor of The Rodent's Gazette in New Mouse City. In this book, Geronimo receives a strange, coded message that leads him and his friends on a thrilling quest. The message involves secret codes and riddles, taking readers through an exciting mystery full of unexpected twists.

The book is filled with colorful illustrations, and the story encourages problem-solving and critical thinking as Geronimo deciphers the message and uncovers the mystery.