Good Cop, Bad Cop: Kid And Crona's Most Challenging Case?

A serial murderer is plaguing Death City and the Chief of Police puts his two best detectives on the case; Detective Inspector Kid De'Ath and DCI Crona Makenshi. Problem is they haven't worked together since Kid called off both their partnership and their relationship. Now they're forced back together and the past inevitably gets dragged up more than the case. AU