The Chrysalids: Popular PenguinsAs David and Rosalind grow older, it becomes more difficult to conceal the differences which would label them as mutants from the village elders. Soon, they face a choice: wait for eventual discovery or flee to the terrifying and mutable Badlands. The Chrysalids is a post nuclear apocalypse story of genetic mutation in a devastated world. It explores the lengths the intolerant will go to in order to keep themselves pure.