Dex and Kane are both absolute sweethearts. The story is about the things which happen to them. I'm so thankful that it wasn't Idiot A misunderstands what Idiot B says/means/intends and it takes forever for them to work their differences out. In this one, they actually understand each other really well and any miscommunication that happens is very short-lived. It's about them relying on each other to get them through some painful moments, not the least of which are the events from Chase in Shadow. 
 There's quite a lot of overlap between these two books. While enough of that story is re-iterated in this one that you don't need to have read it first, it might make some relationships more clear, like what happened with Dex and Scott, which we don't see in this story, but it is mentioned. Chase is a much more painful read though, so you have to be ready to cry. Dex in Blue has some troubling moments, but I didn't feel anywhere close to crying while reading this one. 
 Oh, and if you want Donnie's story, read Super Sock Man. There's a shorter version which was released as a free read, and the extended version which was released a few months later. 
 So, I enjoyed reading it. I'm looking forward to more Johnnie's stories. =)