Because she's so needed at home, Jacqui feels a little—okay, a lot—guilty for stealing away in the early hours of the morning.  But, she's got to find her older brother, Dean, who's been missing for a year and a half.  They haven't heard a word from him, so although Jacqui fears the worst, she also hopes for the best.  Because Dean left to escort a former neighbor to a rumored safe haven in Wyoming, Jacqui goes to her daughter for help.  Fiona Tarsis, now living inside the wall, brings along two others—her boyfriend, Bowen, and her brother, Jonah.  Cradled in Jonah's backpack are bottles of bee flu antidote, precious bargaining chips.  But when they're stolen, the group is left with few advantages.