The first volume in the original series is officially titled Mi nombre es Stilton, Geronimo Stilton (or Lost Treasure of the Emerald Eye in English). It is a delightful introduction to Geronimo's world. The story begins when his sister, Thea, discovers an old, mysterious map. Before he can squeak with surprise, Geronimo is pulled away from his quiet work at the newspaper and thrown into a thrilling race to find a long-lost treasure.