The Lair (The Farm 2) by Emily McKay (2013) - Lily and Carter make it to the resistance base camp in Utah, but after a Tick attack decimates the camp, Lily and her pregnant friend, McKenna, decide to make the hard trek north to Canada—and safety. Meanwhile, Mel is being taught to survive as a vampire by Sebastian while dealing with the fact that her autism was cured by the vampire bite.
Born (Born 1) by Tara Brown (2012) --- Ten years ago when the world ended, Emma ran when her daddy told her to. She hid like he said she should. He was the first person she turned her back on. The first one she let die. "Don't help anyone. Don't go where other people are unless you have to. Trust no one. Always pull the trigger." Until one night she hears the worst sound in the world, a knock. A simple, timid knock, on the door to her cabin.
Prodigy (Legend 2) by Marie Lu. June and Day arrive in Vegas just as the Elector Primo dies, and his son Anden takes his place. The two join a group of Patriot rebels eager to help Day rescue his brother and offer passage to the Colonies. They have only one request—June and Day must assassinate the new Elector. But as June realizes this Elector is nothing like his father, she’s haunted by the choice ahead.
Burn Out by Kristi Helvig:(2014) --- Most people want to save the world; seventeen-year-old Tora Reynolds just wants to get the hell off of it. Holed up in an underground shelter, Tora is alone--her brilliant scientist father murdered, her mother and sister burned to death. When family friend, Markus, arrives with mercenaries to take the bio-energetic weapons her father created, Tora's fury turns to fear when government ships descend in an attempt to kill them all.
Champion (Legend 3) by Marie Lu. June is back in the good graces of the Republic, working as Princeps Elect while Day has been assigned a high level military position. Just when a peace treaty is imminent, a plague outbreak causes panic in the Colonies, and war threatens the Republic’s border cities. June is the only one who knows the key to her country’s defense, but saving the lives of thousands will mean asking the one she loves to give up everything he has.