Plastic Girl: Extinction

In Extinction, the second book of the Plastic Girl series, sisters Eva and Iris evade monstrous lifeforms, defeat violent invaders, and unlock evolutionary secrets as they fight for what's left of humanity. Lost in the labyrinth caves below Bear Island, Eva and Iris confront a deadly threat from a longtime ally-the species born of plastic. On the surface, the teens from the post-apocalyptic mainland return and discover the island's long-extinct plants and animals and quickly divide into fac...