So, it's hard to tell if this might be the end of the series. It's certainly a good place to end it, because if Roan keeps on going the way he is, he will certainly kill himself from all of the partial shifting he's been doing. (And while that certainly would be a natural way to end the series, it wouldn't be a very happy one.) 
 He's finally accepted the moniker of Batman (though now people are calling him Hulk and Superman too), and though Dylan has accepted that the superhero who wants to protect everyone is who Roan is, he knows Roan is killing himself by trying to be that city protector. After a few more attacks on Dylan (becoming more frequent), a few more trips to the hospital, and the Feds becoming interested in using Roan for his superhuman abilities, Roan finally comes to the conclusion that he has to retire if he wants to have any life left to live with Dylan. And he'll have to move, or else the SPD (and the Feds) won't leave him alone. 
 So, that begs the questions: What job will actually be the last job? Where will Roan and Dylan go? And what will their friends think? 
 We get to see Holden come unraveled as he gets closer to Scott (against his better judgment, and possibly his will), and brief scenes with Tank, Fiona, Grey, and Rosenberg. But it's mostly Roan, Dylan, and Holden and Scott. If this is the end, it's a pretty good tie-up. 
 There was one thing that happened that gives me hope there just might be something more to the series (I mean besides Infected: Paris, which will be a prequel to the series, not a sequel to this story): (view spoiler)[In one of Roan's unconscious hospital trips, he starts to see Paris, Dee, and Dr. Rosenberg in his dream, only I got the feeling that it might have been either the lion/virus trying to communicate with Roan's consciousness. And that would be so awesome if that's what was happening to him. (hide spoiler)] So, I could easily see there being at least one more story about whether or not Roan's retirement actually helps lessen his viral load and keep the lion from coming out randomly, and what he decides to do about letting the lion out occasionally, because he can't keep it bottled all of the time (or can he?). 
 In the meantime, I'm really looking forward to the next story, Infected: Paris, the prequel. The last 4% of this book was the first chapter of Infected: Paris, which shows how they first met. =)