Lost treasure of the emerald eye

Lost Treasure of the Emerald Eye (the first book in the Geronimo Stilton series):

Geronimo Stilton, a quiet and bookish mouse who runs The Rodent’s Gazette newspaper, prefers a calm life filled with reading and writing. But his adventurous sister, Thea, discovers a mysterious old map that supposedly leads to the legendary Treasure of the Emerald Eye. Excited, Thea convinces Geronimo, along with their cousin Trap and nephew Benjamin, to set off on a thrilling sea voyage.

Their journey is full of humor, challenges, and unexpected twists as the family faces storms, shipwrecks, and wild escapades while following the treasure map. In the end, the greatest treasure isn’t gold or jewels, but the fun, teamwork, and memories they create together.