Cruises are often taken for special occasions, and in this case, Lane and Roger are celebrating their divorce. Actually, they just didn't want to lose the deposit made in happier times. They agree not to get in each other's way if presented with any romantic or sexual opportunity.
Roger goes right out looking for sex, but Lane isn't in a rush. With the unasked for help of a loose cat and an overly-precocious young lad, Lane bumps into Steve. After a few shared meals, shore tours, and a life-threatening storm that leaves the ship stranded in darkness, bumping turns to humping, and their relationship grows.
Shipboard romances are iffy, though. Can theirs survive a pirate invasion, a disabled ship, and a slam-the-door argument?