Into the Drowning Deep (Rolling in the Deep, #1)

by Mira Grant

Humanity had chosen the land over the sea millennia ago, and sometimes—when she was letting her mind wander, when she was romanticizing what she did and how she did it—she thought the sea still held a grudge. Breakups were never easy, and while humanity was hot and fast and had had plenty of time to get over it, the oceans were deep and slow, and for them all change had happened only yesterday. The seas did not forgive, and they did not welcome their wayward children home.