Valerie and Melissa Webster are as close as sisters can be. Because their not-so-ideal childhood forced them to take care of each other when no one else would, and because some things never change, they continue to be stuck together like glue. Perhaps too much so.
In an effort to create some semblance of independence, both sisters have deliberately kept a part of their lives completely private, neither one guessing each had such perfectly hidden secrets. The close quarters of a cruise ship, however, are less than ideal for keeping secrets and their lives take quite a turn when they are forced to reveal themselves to one another, and to the world.