Wyrd Sisters by Terry Pratchett

When a corrupt duke murders the rightful king of Lancre, three local witches find themselves drawn into a royal conspiracy. Granny Weatherwax, Nanny Ogg, and Magrat Garlick must use their unique brands of magic to restore the true heir to the throne. This humorous fantasy brilliantly parodies Shakespearean tropes while exploring the power of stories and fate.