This book picks up where Enclave left off: Deuce, Stalker, Tegan, and Fade living in Salvation and trying to find a life there. There is a love triangle afoot, as well. Fade thinks that Deuce likes Stalker, while Deuce likes Fade (and Fade likes Deuce), while Stalker also likes Deuce, but she does not reciprocate that. The Freaks/Muties are also becoming smarter to the point of understanding the fields that the Salvationites plant are imperative to their survival and thus destroy them. This leads to an outpost (hence the title) being set up to protect the fields. Deuce, Stalker, and Fade go on a recon mission at night to find out where the Freaks/Muties are and they discover that they have their own little semi-civilization like Salvation. They return to the outpost and tell Longshot (the leader of the outpost who also rescued them and brought them to Salvation) what they saw, and even though he believes them, he does not decide to do anything about it. Later, both Fade and another outpost soldier are captured in the night, leading Deuce, Stalker, and two other soldiers on a mission to rescue them. I thought this book picked up really well from where Enclave left off and I could figure out/piece together what had happened in the end of the first book. I am looking forward to the third installment, Horde, to come out later this year.