Tom's life is in jeopardy when his beamer floats into space, where he meets an unexpected visitor.
The 2nd Mass is left without food after an unexpected skitter strike. Maggie, Ben, Pope, and Sara embark on a risky trip in search of supplies.
The 2nd Mass determines the source of the enemy troops' supplies, and with Volm's cooperation, Tom's leadership spreads to the scattered human militias worldwide.
As an attempt to obtain cars and gasoline goes wrong, Cochise informs Anne of disturbing news that will put both her medical and leadership abilities to the test.
The 2nd Mass departs from Chinatown searching for what they wish to be the last Espheni conflict. Along the way, they come upon a violent and desperate shooter who kidnaps Weaver.
Tom seeks shelter with a family that has withdrawn from the conflict. As they search for Tom, Hal and Isabella's romance blossoms.
The 2nd Mass arrives at a fully functioning military facility controlled by Weaver's old sweetheart, as they organize the ultimate attack on the Espheni.
As Weaver learns disturbing news about an old acquaintance, Maggie and Isabella are obliged to team up and the 2nd Mass tries to flee.
As Tom gets a powerful new weapon against the Espheni, Ben seeks to uncover the enemy plans. Pope realizes that Tom is alive, and the 2nd Mass must rethink their situation when an unexpected guest shows up.
The last battle brings the Masons, the 2nd Mass, and their new friends into an American site, filled with perilous hurdles.