Whispers of the Deep
Mira is an engineer who keeps Beta, an underwater city, running, and dreams of helping it flourish. On a solo job in an abandoned section of the city, she encounters an undine, a dangerous merman from an ancient, long-forgotten civilization.
Arges has fought his entire life for his people. With deadly creatures under his control, he plans to eradicate Beta to protect them and their peaceful way of life. But when a human woman saves him, she unknowingly creates a bond he can't ignore.
Humans were forced into underwater enclosures generations ago when the surface became uninhabitable, and centuries of animosity separate the undine from the achromos, the humans who displaced them. As war stirs on both sides, Mira and Arges must decide whether their bond can survive the widening abyss between their peoples. First in the Deep Waters series.
An engineer who keeps the underwater city of Beta running; forms a forbidden bond with Arges.
An undine warrior who initially plans to destroy Beta, but becomes bound to Mira after she saves his life; her love interest.
This is the first installment in the Deep Waters series, which consists of five books in total.
The author includes a foreword acknowledging that the underwater survival mechanics and inventions described are fictional and not based on real science.