Last ones left alive
(Book)

"Originally published in the United Kingdom in 2019 by Tinder Press, an imprint of Headline Publishing Group"--Title page verso.

Raised in isolation on a small island off the coast of a post-apocalyptic Ireland, Orpen's life has revolved around training to fight a threat she's never seen. More and more she feels the call of the mainland, and the prospect of finding other survivors. But that is where danger lies, too, in the form of the flesh-eating menace known as the skrake.