Nate, the great detective, depends on his dog, Sludge, to help him solve all his cases. But Sludge can't help him this time. Because Sludge is lost! Lost inside a big department store in a rainy day.
Nate frantically searches for his beat friend and trusted helper. Salespeople have spotted a wet, slippy, 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 and…until Nate realizes that Sludge can help him with this case!
大偵探奈特依賴他的狗狗阿泥來協助他解決所有的案子。但這次阿泥幫不上忙了，因為阿泥不見了！下雨天時在百貨公司裡人間蒸發了。
奈特發瘋似地尋找阿泥，他最好的朋友以及最信任的幫手。銷售員認出有一隻全身又溼又滑的狗正在到處溜撻。阿泥正在躲他們嗎？
奈特到處尋找，甚至包含本可視而不見的地方，但是每條線索都死路一條，找不出真相⋯⋯直到奈特了解阿泥在這案子能幫上忙。