Nate the Great and the Big Sniff By Marjorie Weinman

(Nate the Great #23)

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Nate the Great solves crimes with his dog, Sludge. But this time, Sludge can't help. Sludge is lost Nate looks high and low. But every clue leads to a dead end until . . . Nate realizes Sludge can help after all