This book has to be read after The 100, and if possible, I’d recommend reading them close together. In case you’ve stumbled upon this review, the premise behind The 100 is that it’s set years after a devastating nuclear war on earth, with the last of humanity living on a large spaceship. Those under 18 who commit crimes are kept in Confinement, and then retried on their 18th birthday. 100 of these are sent on a dropship to Earth, to discover whether it’s habitable again.
This book picks up the story 21 days after they’ve arrived, a length of time which could be important if the effects are radiation start to show themselves. At the end of the first book, the teens have discovered that they’re not alone, and that their are in fact other people still living on Earth. Day 21 focuses on the conflict between these two groups as they interact. As with the first book, we still follow Glass, which allows us to keep up with events on the main ship.
I was a little disappointed with the first book, as my expectations were different having heard the TV show discussed on twitter. With this sequel I knew what to expect, and I enjoyed it a lot more. I already knew the characters, and the Earth-born added an extra desirable layer.
As I said in my review of The 100, this is more of a YA read with a touch of SF, whereas the series sounds much darker. If you enjoyed the first book, you definitely need to pick up this sequel. If you weren’t sure about the first, I’d still say give this one a try, as I found it the better book of the two.