A Shift in Tides: A Mermaid Romantasy (Lost Legacies) by Maddox Grey

Fate can be broken. I am the Merfolk Queen. Through blood and sacrifice—and a little blackmail—I earned it my title. Fate lead me here and I willingly followed the path set before me because I know a secret... I know when the world ends. But more importantly—I know how to stop it. Nine fae are destined to betray us all. They are the key to preventing the end of our realms. This time anyway. Have I mentioned there is more than one apocalypse on the way? No? Don’t worry about it. I’m not afraid to get my hands dirty. Unfortunately, these aren’t just any fae—they’re the Tuatha Dé Danann. The most powerful of all the fae. I need help if I’m going to pull this off and walk away at the end of it. Fortunately, I know a fae warrior who just so happens to owe me a debt. Connor won’t be happy about it, but his honor won’t let him walk away from this. But I know another secret. And if he learns what it is... he might tear out my heart. Read more