Feeling depressed and at lost in life, Kera Van Brocklin’s twin sister, Deidre, decides to leave Michigan and take a job as a bartender with an adventure cruise company in Alaska.One evening, Deidre sees what she believes to be a person falling overboard. She immediately reports it to the captain; the boat is stopped and searchlights scour the water, but nothing is spotted. After an accounting of all the passengers, the captain and the crew conclude that Deidre must be “seeing things.” Deidre becomes even more depressed because she’s not believed, and at times, wonders if she was hallucinating, so withdraws into herself. Until that day…

Back home in Michigan, Kera finds out that her sister has been badly injured in a suicide attempt and is hospitalized in Juneau. Kera hands over the reins of her detective agency to her partner and hurries to Alaska to be with her sister, only to find her unconscious and unable to communicate what had happened to her.

Kera has a difficult time believing that her sister would ever try to take her own life, in her mind, someone must have tried to take it from her.  But why would anyone want to kill Deidre? What was happening on that ship? Determined to find out the truth and with only a few days left of the cruise, Kera devises a risky and outlandish plan to join the crew so she can determine what happened to her sister, all the while placing her own life and that of her girlfriend Mandy’s in perilous jeopardy.