This World Is Not Yours - Kemi Ashing-Giwa

Tor Books - <p>After fleeing her controlling and murderous family with her fiancee Vinh, Amara embarks on a colonisation project, New Belaforme, along with her childhood friend, Jesse. The planet, beautiful and lethal, produces the Gray, a "self-cleaning" mechanism that New Belaforme's scientists are certain only attacks invasive organisms, consuming them. Humans have been careful to do nothing to call attention to themselves until a rival colony wakes the Gray. As Amara, Vinh, and Jesse work to carve out a new life together, each is haunted by past betrayals that surface, expounded by the need to survive the rival colony and the planet itself. There's more than one way to be eaten alive.</p>