Everblue by Brenda Pandos

Seventeen-year-old Ashlyn Lanski is tired of her boring, single life. Swimming and spending time with Tatiana, her best friend, are her only sanctuary.

Publisher Description

The girls plan to leave their drab lakeside town far behind for college, and Ash hopes to finally ditch her longtime crush for Finley, Tatiana’s twin brother. But when Tatiana and her family fail to return home after a family emergency, Ashlyn makes an irrational decision to deal with her loss of them.

She wanted her life to change … he wanted his to stay the same.

Finley Helton and his family are good at blending in with humans as they run their sailing charter business in Lake Tahoe. The truth is they guard an ancient secret. When a not so routine meeting forces Finley, Tatiana and their mother to return to their underwater home of Natatoria, they learn Fin’s father will lead a dangerous mission. They must stay in Natatoria and wait for his return, but Fin can’t stay caged up for long.

Secrets lurk beneath the deep blue waters of Lake Tahoe, and a simple lifesaving kiss will change their lives forever.