Die Buchspringer by Mechthild Gläser

In this enchanting tale, a young girl named Amy Lennox discovers her extraordinary ability to "book jump," allowing her to enter the worlds of the books she reads. While spending the summer on a remote Scottish island with her mother, Amy learns that her family has long been part of a secret society of book jumpers. As she delves into the magical realms of literature, Amy uncovers a sinister plot threatening the very fabric of these fictional worlds. With the help of her newfound friends, she must navigate the challenges of both the literary and real worlds to protect the stories she loves.