The Secret of Platform 13 by Eva Ibbotson

Great Britain’s gump (a grassy bump that’s really a hidden door) is located under platform 13 in an abandoned train station. Every nine years it opens for nine days, revealing a tunnel to another world. This year a rescue mission is sent to recover an infant prince kidnapped nine years before.
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Fantasy/Science Fiction for Grade(s) 5

The Secret of Platform 13 by Eva Ibbotson (Fantasy/Science Fiction fantasy for Grade/s5)