Like any other one, this book is another one of Geronimo's delightful book. The only difference is that in this book he is writing about his ancestor, Geronimo Stiltnoot. But, after all, it is the same writer, right! So why should the writing style change? The story states about how one day Geronimo Stilton finds a book written by his ancestor( Stiltnoot). He reads it and then tells even us what was written there. Like any other of Stilton's books, even this book has a lot and lot and lot and lot of humor! But what happens when Stiltnoot sets off on a mission to a mysterious cave, from where he must get a medicine to save all the people of his village, who have been affected by an odd and unknowing disease! Will Stiltnoot come back alive? Will he finally find the medicine? What will happen next? Well, read and find it out.