With the centenary of the birth of Roald Dahl, what better time to celebrate twist-in-the-tail tales? These days most praise is heaped on Dahl for his delicious, wickedly funny children's books, but in the 1970s he was equally famous for his Tales of the Unexpected, the TV series of his short stories that was prime-time viewing.
    There's still a thriving market for stories with twist endings. Many women's magazines have a special slot for them, but they can belong to any genre or none. Desp...
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