Mr. Satterthwaite has always enjoyed being around young people, their energy and lack of cares. When he is invited to Madge Keeley's for a game of Ouija, he forsakes the comfort of his home in London, and joins in. It's not long before the board surprisingly spells out "QUIN" and the name of a place. Mr. Satterthwaite’s instincts tell him that a murder may occur soon and that he should drop everything to investigate…
Librarian's note #1: it is not known whether this short story was published in a magazine prior to it being in the print anthology, The Mysterious Mr. Quin, which came out in 1930.
Librarian's note #2: the print anthology contains 12 Mr. Quin short stories. Besides those, there are two more found in other collections: The Love Detectives, and The Harlequin Tea Set. Mr. Satterthwaite also appears in Three Act Tragedy and Dead Man's Mirror. All by Agatha Christie, of course!
Librarian's note #3: the entries for all fourteen Mr. Quin short stories can be found on GR by searching for: a Harley Quin short story. Or for Harley Quin. Details such as characters and settings are included for each.