She just wants to save the reefs...and it gets her killed.

Five years after the events of Rip Tides, Lei Texeira gets into hot water investigating a crime scene ninety feet down off of the tiny atoll of Molokini, where the death of a beautiful marine biologist is anything but an accident.

He'll do anything to beat his demons.

Lei's husband, Michael Stevens, is desperate to kill an enemy from within, and it drives him to make a choice his wife will never sanction.

Can Lei and Stevens find the answers they need before their different directions tear them apart?