Stephen King’s return to the world of the Dark Tower, the gunslinger, and his ka-tet is only tangentially related to the epic series.
The Wind Through the Keyhole tells a set of nested stories in what is effectively an imaginative rumination on storytelling and what we as readers and storytellers get out of it. Expect monsters and fairy tales. But don’t expect to be horrified, amazed, amused, or anything except slightly touched. Sometimes that’s enough.