The 100 is the first book in a trilogy of three novels. This book was written by Kass Morgan and was published in 2014.

I discovered this saga through the serie that I really loved.
This trilogy tells the story of 100 teenagers who leave on earth, 100 years after a nuclear war have exploded. The book takes us first into space, where we discover a colony settled there after that the Earth is revealed toxic. From the first pages, we are told that 100 teenage prisoners will be sent to Earth to perform a « test » of radiation. From that moment, we follows four different characters,  with a very personal story. I loved the fact that we discover different perspectives. In this book there are many flashbacks, talking about the past of some characters. I found it interesting but it was sometimes annoying.
It attaches to the main characters much like Clarke, Bellamy, or Wells, the narrator presents them as leaders. This book also contains lots of love, humor and friendship,

This first volume made me want to buy the other, even though I already know the end thanks to the series, but the story and actions are presented differently and make me want to learn more. The characters are engaging, and the last pages of the book are very interesting.