a book
The Underland Chronicles
Suzanne Collins · 2009 · 1733 pages
When Gregor and his little sister discover a strange underground city beneath their New York apartment, he becomes the unwilling participant in a conflict involving giant spiders, bats, cockroaches, rats, and humans.
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sourced from public statements
Rick Riordan
“The first in the series is Gregor the Overlander. A boy falls into a fantastical world under New York. For grades 4th-6th, roughly. Both my sons devoured these.”↗