Nightfall - The Daylight Cycle, #4

In this conclusion to Kody Boye's Daylight Cycle, winter is falling, and bringing with it even more dangers. With the undead hordes still present, and the need for supplies growing each passing day, Dakota Travis and Rose Daniels decide to enlist within the Runner's Corps: the infamous supply running gang that scours the city for anything of use. Fortunately for them, they are skilled survivors, and have the chance of living outside the fort's protective walls.
Unfortunately, their predicament is only growing worse. As their first supply run ends, and a chance encounter with an infamous plant walker brings Rose and Dakota into the limelight, the powers that be decide to orchestrate a task for the survivors-one that may save humanity, or potentially destroy them all.