This book, I feel, marks a change in the series. Until this point, the books have stood pretty well alone. Characters may have appeared in more than one book, but understanding their actions has not depended on having read the previous book, but here that changes. They also start getting somewhat longer, developing both characters and more complicated plot lines. This features the Lancre witches, but without having read Wyrd Sisters and Witches Abroad, much of what occurs here would make no sense. The witches have got home after their trip (as described in Witches Abroad) to find that things have been going on in their absence. For one thing, Magrat finds herself invited to her own wedding. For another, there has been dancing by the stone circle, and that is dangerous at circle time. Folk memory and fairy tale are often based on some nasty, grisly piece of history. In this case the saucer of milk at the step and horseshoe on the door are to keep the eponymous Lords and Ladies at bay. They are glamourous, they enchant and they are not at all nice. But circumstances conspire and they break through to disturb the midsummer marriage. But there can only be one queen in any one country and things come to a head. Magrat discovers some inner steel, Nanny Ogg is wooed and Granny Weatherwax has a personal complication in the form of an old suitor and a possible appointment that is clouding the future.