This book was very different from Special Delivery in that Special Delivery was a hot and heavy romance, full of passion, kink, emotions, hot sex and love. Double Blind was definitely a romance, but there was much more character development and a story outside of the romance. It was interesting to read how the characters changed over the course of the book. Randy and Ethan really got to know themselves as individuals before they committed to a relationship with each other. 
 Mitch and Sam play a prominent part in this story, so I definitely recommend reading Special Delivery first. I wish there was another character in these books that I though might be the lead in a Book #3, but I don't think so. However, I would really like to continue reading about these 4 characters, so maybe...?