Horror at Camp Jellyjam, The (Goosebumps #33) by R.L. Stine - Vintage Paperback

IT'S NOT WHETHER YOU WIN OR LOSE ― IT'S HOW YOU STAY ALIVE!

Swimming, basketball, archery. King Jellyjam's sports camp has it all. Too bad Wendy isn't a total sports freak like her brother, Elliot. But how excited can you get over a game of softball. It's just a game, right? WRONG! Because Camp Jellyjam is no ordinary sports camp. And Wendy's about to find out why. Why the counselors seem a little too happy. A little too obsessed with winning. And why the ground is always rumbling late at night...