As the first book in the series, SPECTRED ISLE establishes the stakes for the main characters, mostly resolving relationship threads rather than logistical ones. This seems to indicate that the mystery at hand will be solved in later books, but that hopefully this main relationship can have a stable configuration going forward. My hope is that these two are good to go, and a new couple would be the focus of the next book. A quick look at the description for the sequel seems to indicate that my hope will bear out. 

I enjoyed this and I plan to read the sequel. I've had a good time with everything I've tried by this author, even if I don't always have a lot of specific things to say. One thing I appreciate is their ability to write so many different historical (usually fantasy) m/m romances while still making very different worlds for the stories. I'm particularly interested in the magical/political aftermath of the demise of Randolph's family, as the forces which led to that particularly terrible string of events seem determined to keep messing things up in the name of legacy.