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While attending a conference in Holland, Dame Beatrice Bradley makes the acquaintance of a chatty but spirited girl named Binnie Colwyn-Welch. Acting on an invitation to meet the rest of Binnie's relations, Dame Beatrice and secretary Laura Gavin are soon surrounded by the eccentric fruit of three comingled family trees. Binnie is set to marry cousin Bernardo Rose, much to the chagrin of Binnie's brother Florian and Bernardo's outspoken grandmother Rebekah. The match does please patriarch Bernard van Zestien, however, an elderly man worth a fortune from his business dealings in diamonds. Combining duty with holiday pleasure, Dame Beatrice and Laura enjoy exploring the Netherlandic towns while keeping an eye on the potentially volatile group of natives. Shortly after Aunt Opal commissions a portrait of the beautiful-yet-cruel features of Florian (including a second study of the young man's hand holding a "delft blue" hyacinth flower), the subject goes missing. An earlier accident involving polish left on the stairs—coupled with a street barrel-organ playing an unusual Scottish lament for the dead—puts the wind up, and Dame Beatrice decides to look into the matter. The trail brings her back to Britain, where Florian might have met his fate while exploring the mines and caves outside Derbyshire. But Laura is spared from rappelling into the cavernous Eldon Hole (much to her adventure-loving dismay): Florian is discovered alive, but not out of trouble. Shortly thereafter, two barmaids die from eating poisoned chocolates, and the pretty young man may have been the intended victim—or a deliberate murderer.
Author

Aka Malcolm Torrie, Stephen Hockaby. Born in Cowley, Oxford, in 1901, Gladys Maude Winifred Mitchell was the daughter of market gardener James Mitchell, and his wife, Annie. She was educated at Rothschild School, Brentford and Green School, Isleworth, before attending Goldsmiths College and University College, London from 1919-1921. She taught English, history and games at St Paul's School, Brentford, from 1921-26, and at St Anne's Senior Girls School, Ealing until 1939. She earned an external diploma in European history from University College in 1926, beginning to write her novels at this point. Mitchell went on to teach at a number of other schools, including the Brentford Senior Girls School (1941-50), and the Matthew Arnold School, Staines (1953-61). She retired to Corfe Mullen, Dorset in 1961, where she lived until her death in 1983. Although primarily remembered for her mystery novels, and for her detective creation, Mrs. Bradley, who featured in 66 of her novels, Mitchell also published ten children's books under her own name, historical fiction under the pseudonym Stephen Hockaby, and more detective fiction under the pseudonym Malcolm Torrie. She also wrote a great many short stories, all of which were first published in the Evening Standard. She was awarded the Crime Writers' Association Silver Dagger Award in 1976.