You thought you could break into Hogwarts and leave a book hidden in the library shelves for Fred and George Weasley, did you?
Because it would not have been at all sounder, quicker, or more direct to convey such a book to them directly by meeting them somewhere as you did earlier this week, or if that seemed too difficult to arrange, then via their parents either by having Dora give it to Arthur at work, or by leaving it in a safe drop, or by taking it to the Burrow or to Bill's flat, which you've only just visited and thus should know perfectly well how to find again.
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You thought you could break into Hogwarts and leave a book hidden in the library shelves for Fred and George Weasley, did you?
Because it would not have been at all sounder, quicker, or more direct to convey such a book to them directly by meeting them somewhere as you did earlier this week, or if that seemed too difficult to arrange, then via their parents either by having Dora give it to Arthur at work, or by leaving it in a safe drop, or by taking it to the Burrow or to Bill's flat, which you've only just visited and thus should know perfectly well how to find again.
Oh, yes, I entirely believe you.