SpongeBob is on the case in these two great mysteriesand each book comes with a sheet of holographic stickers! In The Case of the Lost Shell, SpongeBob SquarePants is sleeping peacefully when he hears the cries of Gary, his pet snail. Gary is wailing because his shell is missing. Where could it be? SpongeBob DetectivePants and his trusty assistant, Patrick PatrickPants, are on the caseand they won’t rest until the lost shell is back on Gary’s&back. In The Case of the Ruined Sign, when SpongeBob notices that the Krusty Krab sign has been ruined, he’s off to find who did it! Noticing that the sign’s broken wood looks “karate chopped,” his first suspect is his good friend, Sandy Cheeks. Could she be the culprit?.