Duplicity

"It's the end times, danger lurks around every corner, and not all friends can be trusted. Willow Archer is trying to keep her band of believers alive during the tribulation, but new members are joining quickly, and some have their own agendas. Strange disappearances plague her group, and she must keep her wits to find missing members and fend off subversion." ― quoted from this book's product page on Amazon's website as of 2018-11-13.