A sweet, kind, and funny book by the well-known American writer Jennifer L. Holm, author of New York Times bestsellers, and the winner of three Newbery medals.
In the life of eleven-year-old Ellie, nothing truly remarkable ever happens. But one day a fourteen-year-old boy with long hair shows up at her house. He looks amazingly like… Ellie’s grandfather! The great explorer, Ellie’s grandfather, has always been obsessed with eternal youth. His latest invention is an elixir of immortality. After trying it himself, the grandfather unexpectedly began to grow younger and turned into a boy. Now he needs to patent his discovery.
But it’s not that simple—he’s a teenage boy and nobody believes in his invention. Ellie and her loyal friends come to the scientist’s aid.