Once again I have to say that I just can't understand Lori Foster's idea of a romance. I started out liking this book better than others in the series because it seemed like Spencer was going to be a hero, but an ordinary man hero, instead of the plastic perfect heroes of the 3 previous books - richer, taller, and more weaponed than any other person on the planet. But no, instead we get that other weird LF thing, where the hero of the book doesn't actually get to be the hero. Instead in this book Jackson is really the hero, and seemingly Arizona's love interest, for a good par of the story. And then of course, at the end Spencer gets sucked into the weird world of the gang. 
 Arizona is a deeply troubled young woman who was caught up in sex trafficking as a teen and rescued by Jackson in a previous book. She's just turned 21 the day the story opens and so far has had no normal experiences in life (shades of Prissy from a previous book). In fact, after she's rescued, Jackson sends her to a finishing school because of course that's what you do with all abused girls. Apparently no counseling, therapy, or normal school experiences allowed. 
 So I could get around the age difference between Spencer and Arizona (11 years.), but not the fact that she's still so troubled throughout the book. And the fact that the choices for women in this world seem to be between working as a vigilante (not a good life choice for anyone in my opinion) 0r being eye candy (the other three wives don't work, never even leave the secure compound apparently, and have their beauty treatments imported in via the gay lover of Dare's assistant.) In fact, although the three men have individual personalities (as much as super perfect heroes can) and have separate conversations, the three women are mostly referred to just like that "The three women" or "the wives." In fact Spencer's neighbor-with-benefits gets more air time than they do. 
 Anyway for me these books have a kind of creepy modern Stepford like feel to how the heroines are treated by their men. I keep wanting to like LF's writing, but I just never can.