The Christmas season is one of comfort and joy, a season of goodwill to all men, as families and friends come together to forget their differences and celebrate the year together. Unless, of course, you happen to be harbouring a grudge. Or hiding a guilty secret. Or you want something so much you just have to have it - whatever the cost. Ten of the best classic crime writers come together to unleash festive havoc, with murder, mayhem and twists aplenty.