Geronimo Stilton #60 The Treasure of Easter Island’ is again an interesting story in this beautiful and colourful Geronimo series. Here, the tale revolves around Thea, Geronimo’s sister, who is in danger. She voyaged to the Easter Island, looking for a covert fortune. She is stuck somewhere and needs Geronimo’s help. Geronimo must rush as very less time is at hand! Geronimo and his buddies get onto a plane in search of Thea.