Cruises are fun until kidnapping and murder are thrown into the mix when you are hundreds of miles from shore. Where's a boatload of merfolk when you need them? Oh, and did you know that Swan Maidens are absolutely terrifying? Neither did I, but here we are!
Pearl Image: By Flickr.com user "tanakawho" - https://www.flickr.com/photos/28481088@N00/160781390/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=1020048