Wyrd Sisters is pure Terry Pratchett all the way. Classic Pratchett means puns and quirks and oddball images, odder characters and even villains you cannot help but love (sometimes). There are story lines that intermingle and must be paid attention to as they will take you on different paths than expected. I must admit while the Wyrd Sisters themselves have been favorites in other books, in this one they could get a little draining. The lack of intelligence with characters is always an issue with Pratchett. Even the intelligent do not always have the best choices or intentions. Therefore, once again, Pratchett takes humanity and throws it on one heck of a curveball.
Granny Weatherwax teams Nanny Ogg and Margat Garlick to try and help save the life of a prince. Only, in the end things do not turn out as they hoped. Mind you, they were not meddling or anything. Just making sure things are pushed in the right direction. With the help of a reluctant Fool, a ghostly King and others the shenanigans ensue!
I have only read a handful of Pratchett, however, each one has its own uniqueness and yet, they all are part of one world. You can love and hate the character in the same breath. You can love and hate the path they are taking. Realism and fantasy lines are blurred.
Wyrd Sisters has Shakespearian influences. The twists and turns (ghosts, lost princes, witches, and murdering relatives) are from beloved works of the Bard and Pratchett honors, parodies and turns on their heads each one.