I started and finished this book in one day. When I got to the end I was disappointed, not because it was a bad ending (it was great) but because I thought I had more book to read (my edition has a sample chapter from one of Laybourne's other books). 
 I don't know if I want a sequel to this book. On the one hand, the last line perfectly sets up that there is more story to tell (part of why I was surprised to realize I had reached the end). On the other hand, it's sort of fun being able to imagine the different ways the story could continue. 
 Also, since the first book was in the confined space of a cruise ship it made sense for Laurel and Tom to be the protagonists in the crux of the action. A sequel would have a wider setting and it would stretch credibility to have them in a major role.