As the Siren of the Seas nears its next port of call, a group of disgruntled crewmembers circulate a petition to have the ship’s purser fired. Millie is shocked to learn that not only is her close friend’s name at the top of the list, but other loyal crewmembers’ names are listed as well. Her friend swears she never signed the petition, and Millie jumps in to investigate after suspecting there’s more going on than having the purser removed. Millie’s investigation turns into the adventure of a lifetime while visiting two world famous UNESCO sites – the Ring of Brodgar and Skara Brae but ends up being much more than she bargained for. Will the whispers of crew unrest lead to an all-out mutiny? Is one of Millie’s best friends involved in trying to take out the purser? Has Millie finally found herself in so deep that even her husband, the captain of the ship, is unable to rescue her?