The Gray Ghost Murders by Keith McCafferty

 I know I read this years ago but it's not on this blog. I've read all the Sean Stranahan stories, and they are all good. 

The Night Fire by Michael Connelly

 The first "Bosch and Ballard" novel from Connelly, where a retired Harry Bosch teams up with Detective Renee Ballard to solve cold cases on the side. It's another pretty good book (Connelly rarely writes a truly bad book) although I found the ending a little pat.

Dark Sacred Night by Michael Connelly

 Connelly is incredibly prolific. This book has two of his recurring characters, Harry Bosch and Renee Ballard, teaming up to solve a cold case. It's pretty good, and I'll continue reading more in the Bosch-Ballard pairing.