Before Halloween even comes around, grab one or all of these 19 books of scary stories, some of them for younger readers, some of them with more adult themes. What better time to enjoy horror stories and all its engrossing strangeness and dangerous forebodings. Halloween is better known as Sam Hain or the harvest festival of the Celtics that was changed by the Roman Catholic Church into All Saint's Day and All Soul's Day to force celebrants to focus on a more Christian themed holiday of an age-old ritual of thanksgiving to Mother Nature for the blessings .