Geronimo Stilton: respected journalist, family mouse ... well-seasoned traveller? No thank you! But when Geronimo's sister Thea finds a mysterious map of a secret treasure on a faraway island, Geronimo just can't say no. Join Geronimo, Thea, nephew Benjamin and annoying cousin Trap as they sail the high seas and get into enormouse trouble along the way! For children aged 5-7 and also available as part of a 10 book box set.