Read it through once

“Well, the nigger unlocked the padlock when he went in, and he locked it again when he came out. He fetched uncle a key about the time we got up from table—same key, I bet. Watermelon shows man, lock shows prisoner; and it ain’t likely there’s two prisoners on such a little plantation, and where the people’s all so kind and good. Jim’s the prisoner. All right—I’m glad we found it out detective fashion; I wouldn’t give shucks for any other way. Now you work your mind, and study out a plan to steal Jim, and I will study out one, too; and we’ll take the one we like the best.”