While the cover may have you thinking it’s time to dress like Swamp Thing (any excuse is a good excuse), here’s what you need to do: construct a bright green garden on your head, then perch an old LA Dodgers cap on top. Wrap a bloody bandage around one hand. Boom: You’re Dr. Brewer. Now go around telling folks to “Stay out of the basement,” gesturing threateningly with your gross hand.

Bonus Costume: If you’d rather go as Casey Brewer, just walk around with your shirt off, much like Casey weirdly did for almost the entire first half of the book.