358
There are 5 books. Gregor the Overlander is the first. Gregor and the Prophecy of Bane is the second. Gregor and the Curse of the Warmbloods is the third. Gregor and the Marks of Secret are the fourth. And the fith is Gregor and the Code of Claw.
5, the first is Gregor the Overlander, second, Gregor the Overlander and the Prophecy of Bane, third, Gregor the Overlander and the curse of the warmbloods, fourth, Gregor the Overlander and the Marks of Secret, fifth, Gregor the Overlander and the Code of Claw. It is also rumored that Suzanne Collins will write a sixth book right after Mockingjay (the book after Catching Fire and the Hunger Games) comes out.
Gregor and the Code of Claw has 412 pages.
Curse of the Ruins has 96 pages.
The Curse of Chalion has 442 pages.
Curse of the Mistwraith has 688 pages.
The Chimera's Curse has 352 pages.
The Curse of Lono has 208 pages.
Hangman's Curse has 304 pages.
The Curse on the Chosen has 688 pages.
Pandora's Curse has 480 pages.
The Spook's Curse has 432 pages.