The invisible planet /
Geronimo Stilton ; illustrations by Giuseppe Facciotto (pencils), Carolina Livio (inks), and Serena Gianoli and Paolo Vicenzi (color) ; translated by Julia Heim.
- 113 pages : color illustrations, color map ; 19 cm.
- Spacemice ; 12 .
Originally published in Italy by Edizioni Piemme S.p.A. in 2016 under title: Il pianeta invisible.
Appeals to 2nd-4th graders. Reading level: Grade 4.