I like the sequel, Butterflies, better than its predecessor, The Caldwell Ghost. Robert and Simon gets more page time and we know more about their personalities in this book.
Robert is still naive in the ways of the world, but he's naturally curious and that suits his job as a journalist well. He is also very direct and assertive in communicating his feelings and dislikes. In comparison, Simon is the one who's more introvert. Simon's disposition comes from years of experience dealing with ghosts and people's motives in raising ghosts. He has seen things that made him grow older and mature into who he is. I really enjoy the couple's interactions, from letters to blow jobs, in this book.
The mystery plot is chilling with a creepy imagery of butterflies killing people. The description are vivid and I love it. Two people died with mysterious and copious amounts of butterflies around them and in their throats. Simon is called in to investigate and Robert meets him on in assignment from the newspaper. Their partnership on this case is clear and well portrayed.
Overall, this is a great story with a well developed plot and interesting characters. I would recommend reading The Caldwell Ghost to be more acquainted with the characters since Butterflies starts right after The Caldwell Ghost ends and it would satisfy a curiosity of how these two characters meet. However, it's not necessary to do so in order to enjoy the second book. Mystery fans should definitely give this story a try.
I've also reviewed the first book in this series, The Caldwell Ghost, here:
(review of free book)