Several years after the war is over, Lucius Malfoy is found murdered in his own home. Now it falls to Auror Potter to solve this case.

As the title says, Lucius, who managed to avoid Azkaban after the Dark Lord's final defeat, is one day mysteriously killed in his manor, with no obvious culprit present. Harry Potter, an up-and-coming Auror, is assigned the case, likely due to a mix of reasons: him being good at this job, having some prior familiarity with the Malfoy family (after a fashion), and perhaps some interdepartmental politics as well - a major case like that could make or break one's career, after all.

There is, of course, any number of reasons why someone might have wanted Lucius dead. Was one of the Dark Lord's followers still out there, wishing to punish the family that "betrayed" their master? Was it a vigilante, angry about Malfoy not receiving the punishment he was due? Or was the killer someone else entirely?

In any case, Harry (and possibly Ron as well, if he still works as an Auror) will have to encounter the Malfoy family again and dig up some of the many skeletons they have in their manor's cupboards, all the while dealing with Wizarding Britain's inevitably rather divided reaction to the murder.