I've read some of the Argeneau novels by Lynsay Sands and enjoyed a lot of them, but some are just not my cup of tea and Runaway Vampire is in that number. 
 Mary is an older widow who just isn't that nice or interesting. Dante is great and the only thing that really saves the book. The romance between them was just silly (and uncomfortable to read), and was too conveniently resolved. The cliffhanger ending didn't make me want to read the next book. This book dragged and there was a lot of backstory that has been done over and over in the other books that filled a lot of pages, making the story here even flimsier. Not the best of the series by any means.