Inspector DeKok - DeKok and Murder by Melody

Inspector DeKok finds himself in the midst of outwardly disparate motives and personalities surrounding the deaths of two reformed junkies and their landlady, a former prostitute. However, there is one connection in the madness, because music threads its way among and around the list of suspects and victims. DeKok discovers that the trail leading to this melodious murderer is as long as a symphonic masterpiece.