Something Wicked This Way Comes is a 1962 novel by Ray Bradbury. It is about two 13-year-old boys, Jim Nightshade and William Halloway, who have a harrowing experience with a nightmarish and bewitching traveling carnival that comes to their Midwestern town on one October, before Halloween. The carnival's leader is the mysterious "Mr. Dark" who bears a tattoo for each person who, lured by the offer to live out his secret fantasies, has become bound in service to the carnival. Mr. Dark's malevolent presence is countered by that of Will's father, Charles Halloway, who harbors his own secret desire to regain his youth because he feels as though he is too old for Will.
The novel combines elements of fantasy and horror, analyzing the conflicting natures of good and evil and how they come into play among the characters in a carnival setting. Unlike many of Bradbury's other works, including the tangentially-related Dandelion Wine, Something Wicked This Way Comes is a full-length novel.