There are 5 books in the The Underland Chronicles series. The newest book is Gregor and the Code of Claw which came out in 2007.

1
Gregor the Overlander

Book cover of Gregor the Overlander
The first in a gripping young fantasy series from the
author of THE HUNGER GAMES.

When eleven-year-old Gregor falls through a grate in the laundry
room of his apartment building, he hurtles into the dark Underland,
where spiders, rats and giant cockroaches coexist uneasily
with humans.

This world is on…
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2
Gregor and the Prophecy of Bane

Book cover of Gregor and the Prophecy of Bane
The second in a gripping young fantasy series from the author
of THE HUNGER GAMES, re-issued with a striking newly-designed
cover.

Spies have reported the sighting of a Rat King in
the Underland, a character who has been legendary since the Middle
Ages. Recognizable by its tremendous size and snow-white…

3
Gregor and the Curse of the Warmbloods

Book cover of Gregor and the Curse of the Warmbloods
The third in a gripping young fantasy series from the author of THE
HUNGER GAMES.

Gregor and Boots must return to the Underland to help ward off a
plague. It is spreading fast, and when it claims one of Gregor's
family, he begins to truly understand his role in the…

4
Gregor and the Marks of Secret

Book cover of Gregor and the Marks of Secret
Follow Gregor in fourth gripping adventure in Suzanne Collins's masterful New York Times bestselling Underland Chronicles!

Now, in the fourth book in Suzanne Collins's New York Times bestselling series, Gregor is drawn into a crisis. For generations, rats have run the mice--or "nibblers"--out of whatever lands they've claimed, keeping them…

5
Gregor and the Code of Claw

Book cover of Gregor and the Code of Claw
The stunning conclusion to the riveting Gregor the Overlander series by bestselling author Suzanne Collins.

Everyone in the Underland has been taking great pains to keep The Prophecy of Time from Gregor. Gregor suspected it says something awful but he never imagined just how awful: It calls for the warrior's…