It's Summerween in Gravity Falls! Can Mabel and Dipper collect enough candy to save their souls from the Summerween Trickster? Or will they run out of time and become the monster's twin treat? Then, when Dipper and Mabel join Wendy and friends in exploring a haunted convenience store, strange things start to happen. Can the twins escape before it's too late? Or will they be trapped forever by ghosts? .

Happy summerween! is based on the episode "Summerween," written by Tim McKeon, Alex Hirsch ; The convenience store ... of horrors! is based on the episode "The Inconveniencing," written by Mike Rianda. Titles from separate title pages; works issued back-to-back and inverted. The convenience store ... of horrors is inverted. May include two pages of stickers. "2 books in 1 plus stickers!"--Cover.