Research chemist-sleuth Libby Clark must uncover the traitor within in this gripping World War II mystery. May 1945. Harry S. Truman has become president, the A

Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship! The Thea Sisters are visiting a friend in Ecuador who has a sweet job

Poles, Germans, and the Jews themselves were largely unaware, they formed what can aptly be called a secret city. Paulsson challenges many established assumptio

Sabotage in the Secret City! MIT physicist Dale Hargrowe's life is turned upside down when he's unexpectedly ordered to report to Oak Ridge, Tennessee--a city t

Join Thea Stilton and the Thea Sisters on an adventure through Mouseford Academy! The students of Mouseford Academy are participating in an enormouse science fa