A Murder is Arranged

None of the other guests could explain what she was doing in Crooked Lane during the night...
Beautiful Margaret Gask, guest at Scudamore Hall, was shot to death on the driveway of the estate. The mink coat that she should have been wearing turned out to be the first clue Scotland Yard had to work on. Then a man she knew, a receiver of stolen goods, turns up dead. Soon more shady characters are drawn into the story: receivers, jewel thieves, confidence men and convicted felons on both sides of the Channel.
Richardson, now Chief Constable, orchestrates the clues concerning a murdered French senator, the theft of a famous emerald, a fake Italian prince and a mysterious priest who sought sanctuary after perpetrating thefts and felonies all over France. The case ends back in Scudamore Hall, where an ecclesiastical robe replaces a mink coat as Exhibit A.
The last and arguably most entertaining of all the Richardson novels, A Murder is Arranged (1937)...