Patricia Wentworth, "The Grey Mask"

I'm pretty sure I'd not read this one before, but it is a bit difficult to tell with Patricia Wentworth. In this one - the villain is the most unlikely person, the young beautiful people are only implicated by bad luck and villainy, and Miss Silver knits two stockings and a matinée coat. See what I mean...? This one is rather livened up by the introduction of a crime ring (the sort that Christie mocked mercilessly in The Seven Dials and Sayers did with rather more panache in the Open Sesame story whose title I can't at this moment remember), but overall this is a reliable old-fashioned Miss Silver mystery where the good end happily and the bad end unhappily.

http://www.bookcrossing.com/journal/8617467