Going, Going, Gone opens in the library at Sands Middle School where strange things are happening. Vikings burst out of bookcases, Albert Einstein appears out of nowhere, and is that Jackie Robinson tossing a baseball in the corner of the room?

When Librarian Valerie Tremt tells three students that one of the library books, The Book of Memories, is actually a time travel portal, the kids don't believe her at first. But when they ask to see a dinosaur as proof and suddenly there is a terrifying T-Rex in the library, they realize she isn't kidding around.

Now that he can time travel, twelve-year-old Matt knows exactly where he wants to go. In the summer of 1951, Matt's grandfather Joe was on the path to becoming a major league baseball player. But at a 4th of July BBQ, Joe danced a little too close to the edge of a swimming pool and--splash!--he fell in and hurt his ankle. What should have been a minor injury turned out to be a career-ending one. Always the optimist, Joe used to say, "Because of the accident, I met the girl I was going to marry, so it was all worth it."

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? Only time will tell...