After her sister's death, wildlife photographer Pandora Wescott packed up a box of camera equipment that belonged to her older half sister, the famous fashion photographer, Petra Taylor. Petra had taken her own life in her New York apartment and left a note saying that she was sorry, but she just couldn't go on without her "Master." In looking through the photos stored on one of Petra's digital cameras, Pandora is shocked to find out that Petra had been involved in an extreme lifestyle. While clearing out her apartment, Pandora learns about the cruise Petra had taken with her Master on the luxury yacht, the Golden Dolphin, which provides a venue for discrete BDSM cruises. Desperate for information about Petra and her Master, Pandora manages to book an Alaskan cruise under the pretense that she wants to take the new sub training class while completing an assignment in Alaska for a wildlife magazine. Once onboard she meets the handsome and enigmatic neurosurgeon, Dr. John Grayson, who is blown away by the beautiful and mysterious photographer. He is determined to make her his sub and to find out what unhappiness is lurking beneath her surface. Will the secrets they are hiding destroy any chance of a relationship?