Marine biologist Aracellis Frezale's first big break is her heart when she finds a note from her fiancé, Brad, calling off their wedding. She uses her honeymoon ticket to Bermuda to recover by her beloved ocean, only to find Brad at the resort with another woman in his arms. Devastated, Aracellis retreats to the pink sands, where she's drawn out to sea by the powers of the Bermuda Triangle. Instead of drowning, Aracellis makes the discovery of a lifetime on the seabed, the Queen's Pearl, which transforms her into a breathtaking mermaid chosen to rule a hidden kingdom.

But this is no fairytale. Mermaids are women spurned and spared by the sea, and to survive, they must take the final breaths of men. Aracellis is now expected to use her royal power to return to Bermuda as a human siren and lure men out to their watery graves for her starving newfound sisters. It's her chance to seek revenge on unsuspecting Brad, her lungs burning for his last, lying breath, and her opportunity to spare his multitude of secret girlfriends from her same fate. When not hunting, there's something to be explored in mystifying Julian on the island beach. Their souls connect in a way she can't explain, even with science, and it's a struggle to stay away, to protect him and her own heart.

Following the siren call of her (ichthyology based) magic to drown Brad should be easy for a temptress mermaid, but it goes against the human morals she still clings to. If she holds onto what's left of her humanity, including her powerful feelings for Julian, the siren within will turn her into the depraved sea creature of nightmares. Either way, she becomes a monster. To save herself and her kingdom from decimation, Aracellis must choose what kind of monster she's willing to be.