I really enjoyed Breathe and when I found this book I thought it would be interesting to see how all that got set up in the last book would be resolved in only one more.
My main problem with this book is that it all was too perfect, everything happened really quickly and always at coincidental times, anytime the group separated, they were immediately found by one of the other friends, and to avoid any consequences the head of the army had conveniently changed his mind and decided to help them. This book is told from four perspectives, the same three as the last book plus Ronan Knavery, Cain Knavery's son. I also find it really hard to understand how Vanya ran her base with so many oxygen tanks, but didn't have any trees or sources of oxygen like Petra did. My favourite character was probably Bea, she was so strong through everything she did and my favourite part of the whole book was when Jude said that "Bea Whitcraft turns boys into men". I would recommend this series to people who like dystopian novels and like the premise of having to pay for air.
Jazz is severely injured after the destruction of the Grove so Quinn has to leave her and Bea in a train station with many portable air recyclers that were left behind by drifters so they can stay put and be safe while he goes to get help from Sequoia. On the way there he meets Abel and Jo, who had previously left there and are headed back because Jo is heavily pregnant. Alina and Silas are already there and they learn that Vanya, the lady who runs the Sequoia rebellion is crazy, grows no trees and forces the people living there to breed as the thinks children raised in this environment can be immune to the low oxygen levels. When Quinn gets to Sequoia, Vanya refuses to send help for Bea and Jazz until she learns that it is Jazz, her child, that is injured. Ronan had been sent out by Jude to go find Quinn but instead he found Bea and Jazz, he radioed Jude and got him to take Jazz back to the pod so she could get medical assistance. When Quinn comes to find Bea and Jazz he talks to Bea and she tells him that she and Ronan have made a plan to get Jude to recruit and train auxilaries that are part of the resistance as part of the army so they can turn on the pod when they are ready. Quinn tells Bea to go back with Ronan and he will go back to Sequoia and tell Alina and get her to come back with him. Once Bea and Ronan are back at the pod, Quinn and Alin start they're escape with all of their other allies at Sequoia and on their way they learn that Vanya plans on destroying the recycling plants at the pod so they kill everyone inside. Chaos break out in the pod when Vanya's army attacks and the rebels aren't as prepared as they thought they'd be, Alina, Quinn and Silas saw Vanya's people headed to the pod so they ran there to make sure they could help fight. When there is one recycling plant left, Alina takes the bomb that Vanya has set in it and runs it out of the pod and dies. The rebels eventually subdue Vanya and her people and have one recycling plant left standing. The book ends a few weeks or months later, it's not really clear, where Bea, Quinn, Maude and Ronan are building a settlement a few hundred metres or so away from the pod with a giant nursery that Abel is constantly tending to.