Ellie's scientist grandfather has discovered a way to reverse aging, and consequently has turned into a teenager--which makes for complicated relationships when he moves in with Ellie and her mother, his daughter.

When thirteen-year-old Ellie's Grandpa Melvin, a world-renowned scientist in the body of a fourteen-year-old boy, comes for an extended visit, he teaches her that experimenting--and failing--is part of life.

During a rough year in which she was placed in the care of her prickly grandfather after her father suffered a stroke, Rosie embarks on a search for her missing dog after he is given away by her estranged mother.

Sunny Lewin is sent to live with her grandfather for the summer in Florida, where she befriends Buzz, a boy completely obsessed with comic books, and faces the secret behind why she is in Florida in the first place.

Alex, nearly thirteen, flees with his grandfather across snowy Europe to escape the human and mechanical assassins that pursue them, trying to retrieve a powerful object.

Twelve-year-old Trevor Firestone loves playing war-based video games and he idolizes his great-grandfather Jacob who came home from World War II a celebrated hero; now ninety-three Jacob wants to retrace his journey in memory and reality and return to the small French village that his unit liberated, and Trevor is going with him--but not everyone in the town want Jacob to come, and Trevor is going to learn an important lesson: real war is not a video...

"Four short stories set in a hutong, or residential alleyway, of Beijing, China. Yu'er, her grandfather, and their eccentric neighbors experience the magic of everyday life."--

Life is tough at home for Marty, but his eccentric grandad has a plan up his sleeve to give him hope that involves wishes, a pumpkin, and a trip all the way from England to Paris.

From age seven, Loma relishes traveling with her beloved grandfather across fifteenth-century Spain, working to keep the Jews safe, but soon realizes she must also make sacrifices to help her people. Includes historical notes, recipe, glossary, and a link to a bibliography.

In 1920s New York City, a young girl with a deformed foot recruits her new friends, a female pickpocket and two circus performers, to help recover an emerald from her grandfather's mansion in upstate New York after he loses his home to an unscrupulous tycoon.