Larry, a playful pup, loves to go on vacation with Pete. In this edition they visit Pete's grandparents on a farm. When a bookmobile arrives, Pete is excited to select a stack of books. As Pete reads, he doesn't notice that Larry, in search of a snack, wanders into the bookmobile.

Larry's adventure begins when the librarian drives away, not realizing Larry is on board, to return the bookmobile to the city library. Larry, searching for Pete, soon finds himself lost inside the library, where he is surrounded by busy librarians and patrons enjoying books. But will he ever find his way back to his best friend Pete?