Ruth Evergreen has been afraid of water her entire life and insists on keeping her distance until she's forced by some friends to stay at a beach house for a few weeks with them. Things go from scary to terrifying for her when she finds herself stuck sinking in the ocean far from shore. About to drown, she's rescued by a mysterious young man who calls himself Adam. He brings her to shore and disappears back out to sea but leaves a mark in her brain. Who was he? Why was he so far from land? Time passes and she sees him again quickly becoming his friend but when the legend of a tormented sea spirit comes to her awareness Ruth begins to question Adam's real identity and motives.