Kaida, Zeke and Joy are all going on a class trip to Carlsbad Caverns. They are riding together with one of their teachers. While in the middle of the desert they end up in a crash. Everyone manages to escape the wreckage but they cannot find their teacher. When it starts pouring rain they take refuge in a cave. Trying to keep away from the opening Joy backs up into the cave and falls into a hole. While trying to rescue Joy, both Zeke and Kaida end up in the hole also. Searching for a way out they find themselves once again falling.
The story picks up with Kaida waking up thinking that she has had a bad dream. But it seemed so real to her. When she arrives at school she finds Zeke looking at her in an odd way. Realizing that they need to talk they meet up. While walking along they see a man hit by a car. Nobody helps him, pretty soon a van pulls up and men get out and load up the bleeding man. Everyone acts like nothing has happened. When Kaida mentions it at home to her brother she is told not to talk about it.
It doesn't take long for Kaida, Zeke and Joy to realize that they are not living in the same world that they left before the accident. Nobody mentions being sick. There are no hospitals and no drugs. To speak of these things could get you arrested.
While trying to find some "spills"(illegal medicine) to help heal Joy's arm and a friends mother the group is arrested and put into jail. Racing the clock to escape and find their way back to the exact spot that they arrived in is an exciting adventure.
I really enjoyed this book. It kept my attention and kept me on the edge of my seat. I think that Prism ended in a way that could leave an opening for a series or at least another book. I haven't heard or read anything that there will be, but I would look forward to a second book.