닫기 큰일 났어요. 항상 충직했던 개 Sludge가 백화점 밖에서 사라졌거든요. 비도 내리는데, 어디로 갔을까요? 혹시 어딘가에 숨어있는 건 아닐까요?

Nate, the great detective, depends on his dog, Sludge, to help him solve all of his cases. But Sludge can’t help him this time ― Sludge is lost! Lost inside a big department store on a rainy day. Nate frantically searches for his best friend and trusted helper. Salespeople have spotted a wet, slippery, sloppy dog running about. Is Sludge hiding from them? Nate looks high and low, and in places he’d rather not look at all. But every clue leads to a dead end . . . until Nate realizes that Sludge can help him with this case!