The Shimmers in the Night — Lydia Millet

Cara's mother is still missing. When her brother Jax texts her from "smart kid's boot camp" in Boston, Cara and her two best friends go to the rescue. But the camp is a front for Cara's mother's organization who are fighting against a force who wants to make the planet over in its own image, which will leave no space for anything else, animal, insect, or human.