The Invisible Planet (Geronimo Stilton Spacemice #12), by Stilton, Geronimo
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- ISBN: 9781338215045 | 1338215043
- Cover: Paperback
- Copyright: 1/30/2018
Geronimo discovers a planet on the radar that mysteriously appears and disappears. MouseStar 1 lands to investigate and they discover mysterious aliens who hide a secret!