No Song for the Dead by Jussi Adler-Oleson
This is the newest in the popular Danish series featuring Department Q, which solves cold cases in Copenhagen. Carl Morck, the leader of the team, is now a crime writer who only consults with the team. Assad and Rose are joined by a French cop named Helene. Rose doesn't like her at all, saying she has too many secrets--and she does indeed have a lot of secrets. But Assad is willing to partner with her and they end up saving each other. The story starts with a young boy being tormented by other boys at a school for singers and musicians. When a cold case seems to tie back to that school, the team is on the hunt. It's quite a compelling story. And there are a few cliffhangers at the end, so I hope we don't have to wait long for the next installment.