Seahaven

He's reckless, impulsive, and barely eighteen, but Flynn Arcturus is the best damn pilot on the ocean floor. In his short lifetime, he's dealt with angry sea dragons and seductive mermaids, but nothing could have prepared him for the death of his parents.

Flynn's parents aren't the first to die under mysterious circumstances. Many residents of Seahaven, the domed underwater city where he lives, are getting killed by seemingly random acts of misfortune. When he investigates, he discovers an ancient threat, imprisoned for centuries, that once again endangers Seahaven.

Equipped with superb piloting skills and an extraordinary ship built by his genius brother, Flynn may be the only one who can save Seahaven. But when he discovers what he's up against, he realizes he's out of his depth.