I decided to read Gregor the Overlander because I had read The Hunger Games, Catching Fire and Mockingjay (which are also by Suzanne Collins) and liked them.
A boy named Gregor falls through a heating vent casing after his little sister. He then finds a mysterious new world:the Underland. He takes part in a prophecy called the Prophecy of Gray so he can go back up to the Overland. While fulfilling the prophecy, he finds his missing father.
I liked this story because the Underland's customs are so much different than the Overland's.
Gregor the Overlander is the first book in a series five, so if it sounds interesting, you decide to read it (and like it) you can read the next four books!