It's early evening on Friday 19th September 1997, and Lizzie and Andy find themselves returning to school to pick up the items that Andy has once again forgotten. What they thought would just be a swift trip into the library soon turns into a time-travelling adventure when Lizzie and Andy discover a worn, tired-looking book that seems to be making a peculiar noise. The pair quickly become involved in solving an age-old quest to save a rare and magical piece of blue glass and with each turn of the page, the children realise that a book can hold far more than just a story...