Mander’s Department Store in London’s West End is so famous for its elaborate window displays that on Monday mornings crowds gather to watch the window blinds being raised on a new weekly display. On this particular Monday, just a few weeks before Christmas, the onlookers quickly realise that one of the figures is in fact a human corpse, placed among the wax mannequins. Then a second body is discovered, and this striking tableau begins a baffling and complex case for Inspector Devenish of Scotland Yard.