Geronimo Stilton's sister, Thea, is a born adventurer who never shies away from a difficult but intriguing journey when she finds one. Along with five of her students, who call themselves the Thea Sisters, she has traveled the world and solved many a mysterious situation. And in this book, her biggest fans are on their way to beautiful springtime Tokyo and all its magic!

The Thea Sisters are off for a cultural exchange program in Japan, which they've looked forward to for some time. They jet off to beautiful Kyoto, where they are enraptured by the blooming cherry blossoms and enjoy a time-honored tea. However, the fun is interrupted by a most valuable item being stolen. The Thea Sisters are on the case. But what will it take for them to Catch a Thief?