This is book number 6 in the Discworld series.
Terry Pratchett’s fantasy classic Wyrd Sisters, a novel in the Discworld series, is the story of Granny Weatherwax, the most highly regarded non-leader a coven of non-social witches could ever have.
Generally, these loners don't get involved in anything, mush less royal intrigue. but then there are those times they can't help it. As Granny Weatherwax is about to discover, though, it's a lot harder to stir up trouble in the castle than some theatrical types would have you think. Even when you've got a few unexpected spells up your sleeve.
Granny Weatherwax teams with two other witches — Nanny Ogg and Margat Garlick - as an unlikely alliance to save a prince and restore him to the throne of Lancre, in a tale that borrows — or is it parodies — some of William Shakespeare's best-loved works.
Sir Terry Pratchett was the internationally bestselling author of more than thirty books, including his phenomenally successful Discworld series. His young adult novel, The Amazing Maurice and His Educated Rodents, won the Carnegie Medal, and Where's My Cow?, his Discworld book for “readers of all ages,” was a New York Times bestseller. His novels have sold more than seventy five million (give or take a few million) copies worldwide. Named an Officer of the British Empire “for services to literature,” Pratchett lived in England. He died in 2015 at the age of sixty-six.