A Secret Life by Debra Jess

Secrets, like sharks, can kill.

Gillian Sands prefers to swim beneath the surface of Mystic Bay, rather than live on land where no one sees her as human because of her gills. However, vengeance for the dead refugees after the latest terrorist attack on Thunder City brings her out of the water. Despite working with the Thunder City defenders, she’s willing to break the law to get justice, and not even playboy superhero, Evan Blackwood, can stop her.

Evan Blackwood has had his sights on Gillian for years because of her renegade spirit, killer body, and passion for life. When Gillian asks for his help with her investigation, he jumps at the opportunity to prove he’s more than just the womanizer everyone sees in the newspapers. 

As their investigation brings them closer to danger, Gillian begins to see underneath the façade Evan shows the world. When morals are tested and desire burns bright between them, can Evan stop Gillian from breaking the law, or will he lose her forever to the depths of Mystic Bay?