The reason is "the touch of class" and the difference from other "cop shows". 1st ep: psychiatrist 2nd ep: lawyer 3rd ep: (co)writer [or co(writer) :-)] 4th ep: head of investigation company 5th ep: general 6th ep: art critic 7th ep: heiress of an "advertising empire" 8th ep: chemist 9th ep: architect etc ...
2nd SEASON 1) orchestra conductor ("maestro") 2) botanist and orchids collector 3) manager of a sport empire 4) theatre actors 5) actress/star 6) surgeon 7) chess champions 8) heirs of a financial fortune