I loved both of these books in the 2 part series Stung. Easy, fast read. I finished both books in a 3 day span...course I am on summer break! ;)
Summary from goodreads.com:
Now that Fiona Tarsis and her twin brother, Jonah, are no longer beasts, they set out to find their mother, with the help of Bowen and a former neighbor, Jacqui. Heading for a safe settlement rumored to be in Wyoming, they plan to spread the cure along the way--until they are attacked by raiders. Luckily, they find a new ally in Kevin, who saves them and leads them to safety in his underground shelter. But the more they get to know Kevin, the more they suspect he has ties to the raiders. He also seems to know too many details about Jacqui and her family—details that could endanger them all. For the raiders will do anything they can to destroy the cure that would bring an end to their way of life. Bethany Wiggins’s reimagining of our world after an environmental catastrophe won’t fail to stun readers.