Deep Waters Series by Emma Hamm

One of the many engineers that keeps Beta, the city under the sea, running, Mira only wants to make her family proud and to prove herself worthy. She knows the mysterious city better than anyone and it’s her dream to help it flourish. But then, on a solo job in an abandoned section of the city, she encounters a monster of legend. An undine. A dangerous merman from an ancient civilization, long forgotten. Arges has fought his entire life for his people... moreOne of the many engineers that keeps Beta, the city under the sea, running, Mira only wants to make her family proud and to prove herself worthy. She knows the mysterious city better than anyone and it’s her dream to help it flourish. But then, on a solo job in an abandoned section of the city, she encounters a monster of legend. An undine. A dangerous merman from an ancient civilization, long forgotten. Arges has fought his entire life for his people. With deadly creatures under his control, he plans to eradicate Beta once and for all to protect his kind and their peaceful way of life. But when a human woman saves him, she unknowingly creates a bond between them, one he can’t ignore. Even though her flaming red hair haunts his dreams, he needs her for information on the undine’s enemies. So he steals her. Keeps her. Feeds her. Only to realize their bond is far deeper than captor and captive. He cannot let her go—but he cannot keep her under the sea. In a battle to determine if love can survive a war beneath the waves, it will be their decision that changes the tides. less

Like a songbird in a cage, Anya has spent her entire life as the General's perfect daughter. He snaps his fingers, she jumps. He tells her to smile, she beams like she is made of the sun itself. But underneath all those games and glitter, she's working to destroy her father and save the city she loves. When an undine sneaks his way into her city, intent on kidnapping her, she lets him take her. Daios is plagued by the decisions of his past... moreLike a songbird in a cage, Anya has spent her entire life as the General's perfect daughter. He snaps his fingers, she jumps. He tells her to smile, she beams like she is made of the sun itself. But underneath all those games and glitter, she's working to destroy her father and save the city she loves. When an undine sneaks his way into her city, intent on kidnapping her, she lets him take her. Daios is plagued by the decisions of his past. Souls haunt him, memories follow his every move, and all he knows is that perhaps stealing this woman will absolve him of his sins. If he can bring her back to his people, then they can destroy the city where his hatred was born. He’s certain this will be easy. But then he sees the General’s daughter, and he knows nothing will ever be the same again. Broken and damaged, he's certain no woman will ever love him. He shouldn't even try to encourage the mating instincts that ride him hard the moment he sees her. But when he realizes that she's the same as he is, different from her people and on the outskirts of what others deem "normal", he knows he's a goner. Even if it means he has to risk everything to keep her. less

When the jokester of the group finds a woman so serious he can't help but tease her, sparks will fly in unexpected ways. Deep Waters book 3 will follow our dearest Maketes...