Maze runner

The book I am reading is maze runner it's about how a boy named Thomas was sent to this place called the glades in it there is four walls surrounding it with only one way to get out. The problem is that the one way to get out of the glades is to go through a maze. Everything was fine when before Thomas was sent into the glades. When Thomas came he got a runner killed (Runners search the maze for a way out) and Alby and Minho went into the maze the next day. When they returned the walls/door started to close so Thomas broke a rule and went into the maze and started to help but didn't make it out. That's just one conflict that happened in this book