Deep Calls to Deep: The Ghoul Wars Book 1

The Ocean is a dangerous place, made all the deadlier by the presence of a mysterious enemy that threatens the Mer way of life. A battle-worn soldier since childhood, Master Scout Hydra, with her brother Phoenix and a team of highly-trained warriors, must save her people from the flesh-eating ghouls and find her place in a war that has ravaged her home -but in a time where allies are strained and friends come in the most unlikely places, all is not as it seems.