Gravity Falls: Happy Summerween / The Convenience Store of Horrors

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? Readers will love this eerie book with spooky stickers!