At the start of summer, billionaire couple Francis and Lila Cameron set off on their private luxury sailboat to celebrate the high school graduation of their two beloved children. Three weeks later, the Camerons have not been heard from, the captain hasn’t responded to radio calls, and the sailboat is found floating off the coast of Florida. Empty. Where are the Camerons? What happened on their trip? And what secrets does the beautiful boat hold? Set over the course of their vacation and in the aftermath of the sailboat’s discovery, NO ONE ABOARD asks who is more dangerous to a family: a stormy ocean or each other?