Librarian Valerie Tremt tells three students that one of the library books, THE BOOK OF MEMORIES, is actually a time travel portal. Now that he can time travel, 12-year-old Matt knows exactly where he wants to go. His grandfather Joe was on the path to becoming a major league baseball player until he slipped and fell into the pool and hurt his ankle. The injury turned out to be a career-ending one. Matt wants to go back in time to prevent the accident from ever occurring, so his grandfather can have the career he deserved! But can he successfully alter his grandfather’s past without changing his own future?

Jada doesn’t want to go anywhere special. All she wants to do is go back to last week and study for the spelling test she failed to make her parents happy. Ms. Tremt says Jada can use THE BOOK OF MEMORIES to go back a week, but Jada ends up in 1977 instead! Jada finds herself in the designer’s studio where her Aunt Katie is an intern. She watches as Katie learns just how important spelling can be. Later, Jada decides to make a quick trip to ancient Egypt to get some fashion tips from Cleopatra. But being in the past is so thrilling that Jada almost misses the deadline to return home.

“Graceless Grace” is the smartest seventh grader at Sands Middle School, but she’s constantly being teased for stumbling over doorjambs and knocking over lunch trays. And lately, the name-calling has been even worse. So when Ms. Tremt offers to lend THE BOOK OF MEMORIES to Grace for an extended trip, she decides to go completely out of this world. She travels back to 1969 to stow away on Apollo 11 and become the first kid, the first female, and maybe even the first person to walk on the moon.