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E-book extras: The full text of A Christmas Carol by Charles Dickens; reading group guide.Winifred Rudge, a bemused writer struggling to get beyond the runaway success of her mass-market astrology book, travels to London to jump-start her new novel about a woman who is being haunted by the ghost of Jack the Ripper. Upon her arrival, she finds that her stepcousin and old friend John Comestor has disappeared, and a ghostly presence seems to have taken over his home. Is the spirit Winnie's great-great-grandfather, who, family legend claims, was Charles Dickens's childhood inspiration for…