This book is definitely multifaceted: historical fiction blended with fantasy, crime / mystery / noir, plus a dash of romance.
This works well as long as you like all the genres mentioned above. The only thing that wasn't working for me was the crime novel propensity to carefully describe the hair and facial features of every single character you meet. Other than that, I enjoyed seeing how the author managed to weave all those different genres together.
The relationships between characters are very believable and realistic, and you get to see some historical figures at a very interesting time in Boston's history. Plus, there's magic! I probably wouldn't read a historical fiction alone, but add some fantasy elements and I'm all about it.
Full disclosure: I won this book from the excellent Adventures in SciFi Publishing