Really, really good. Loved how realistic the prison and drug issues were - no one here does drugs, goes to war, or gets thrown in prison without it actually affecting them. And the fact that while everything does get resolved, it takes time and not all the bad guys are vaporized at the end. The bad guys are super nasty, so glad they do get what's coming to them anyway. 
 The childhood connection between the MC also made this work for me. The instalove/lust had happened when they were teens when it makes sense. Once they get back together as adults the chase and the limited time factor obviously make things hotter, but also they really get to know one another. I like the connection between Sophie and Marc's sister, Megan as well. She'd be a hard person to deal with if that hadn't already been there. 
 The supporting characters were fabulous - I particularly liked the friendship that grew between Marc and Julian. It becomes so important in later books in the series. 
 Good writing, great dialogue, and an excellent connection between the couple. Ms. Clare is such a good writer. This series is definitely on my keeper shelf.