Dark Harbor by Emma Mason, a pen name for a best selling author (who!?!) is a stand alone addition to the series Liar's Island. The Liar's Island premise is fairly intriguing actually. A slew of authors write a mystery novel or novella that can stand alone but which are tied together by the island itself. There are shared harbors, shops, inns, etc., but the characters themselves are not intertwined. I have enjoyed some of the books in this series more than other and, obviously, Dark Harbor featuring Charlie Malone, has been one of my favorites to date. Since you don't have read any of the books in order, Dark Harbor is a good place to begin. Enjoy!