book cover of The Thief of Blue Island
 

The Thief of Blue Island

(2026)
(Book 39 in the Geronimo Stilton: Thea Stilton series)
A novel by

 
 
Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship!

The Thea Sisters head to Capri for a new adventure!


Genre: Children's Fiction

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