Amy Lennox and her mother, Alexis, leave their home in Germany after her mother's boyfriend dumps her, and Amy's so-called friends humiliate her. They escape to Stormsay--a small island off the Scottish coast. It is where Alexis grew up, and allows Amy to meet her grandmother. Amy is introduced to a special talent only the Lennox and MacAlister clans share.
Both families guard a massive library hidden under the island itself and act as protectors of the world of literature. Amy is a Reader who, along with Will and Betsey MacAlister, can jump into literature and affect the story as they move about the edges of the stories.
While exploring her chosen novel: The Jungle Book Amy notices something wrong in the book world. Someone is stealing key ideas from the great classics. Amy teams with Woeful Werner to explore and investigate the thefts. When Will's best friend, Sherlock Holmes, is found in the normal world murdered, Will refuses to jump back into books. He agrees to help Amy and Werner from outside literature, but they aren't making any progress. Amy convinces Will to return to the land of literature and their friendship grows stronger as they learn more and more.
Amy discovers some characters from a mysteriously missing, possibly destroyed, story have been closely entwined with both her family's and Will's family's history. When new characters are discovered and seem to be propelling the thefts of literary elements even close friends are suspect.
The Book Jumperhas elements fo the great classics and scenes of Alice in Wonderland, Metamorphosis, The Hounds of the Baskervilles, and various characters from across the literary spectrum. Amy discovers her past is much more complicated than she thought and her newfound ability to jump into stories is directly linked to those complications.
Gläser's novel is aimed at older teen readers, starring a seventeen-year-old dealing with typical teenaged anxiety and stresses in a novel manner. The Book Jumper is translated from German and followed by The Forgotten Book, also translated.