David Walliams, hailed as "the heir to Roald Dahl" by The Spectator, burst onto the American scene with the New York Times bestseller Demon Dentist. Now the UK's #1 bestselling children's author is back with this high-flying adventure about a boy and his grandfather, perfect for fans of Jeff Kinney and Rachel Renee Russell.

Grandpa is Jack's favorite person in the world. It doesn't matter that he wears his slippers to the supermarket, serves

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In England in 1995, fifteen-year-old Tamar, grief-stricken by the puzzling death of her beloved grandfather, slowly begins to uncover the secrets of his life in the Dutch resistance during the last year of the Nazi occupation of the Netherlands, and the climactic events that forever cast a shadow on his life and that of his family.