Author Sherri L. Smith "Orleans"

Fen de la Guerre is living with the O-Positive blood tribe in the Delta when they are ambushed. Left with her tribe leader’s newborn, Fen is determined to get the baby to a better life over the wall before her blood becomes tainted. Fen meets Daniel, a scientist from the Outer States who has snuck into the Delta illegally. Brought together by chance, kept together by danger, Fen and Daniel navigate the wasteland of Orleans.  In the end, they are each other’s last hope for survival.