Storm Kayama needs to build her clientele, so when surf promoter Marty Barstow's wife Stephanie walks into her new law office, Storm agrees to represent her, despite her distaste for a bitter divorce situation.

When Stephanie's son Ben, a promising surfer, invites her to O'ahu's North Shore for a contest, Storm jumps at the chance. Not only will it be a thrill to observe the meet, but Storm will also have the opportunity to watch a distant cousin compete. Nahoa Pi'ilani has grown from a mischievous kid to a surfer of international renown, and he seems to have put the trouble that once brewed between their families behind him.

Then a child delivers a package to Nahoa containing an ancient Hawaiian weapona wooden club encircled with shark's teeth. Storm recognizes the lei o mano. It's a threat, a call to battle.

Events soon suck her into a vortex of escalating peril. As if she were in the green roomthe underwater space where tons of churning water can imprison a surferStorm is buffeted and disoriented by local legend, greed, and cutthroat competition and must confront not only a vicious killer but a haunting incident from her past.