My poor clueless brain!

This is the Fletcher Library where I absentmindedly took Nathan's library book and returned it. However, the book belonged to Mann Middle School! Nathan was told by his teacher that his book MUST be returned Monday. I returned it Sunday. So, I wrote an email to his teacher Mrs. Merry, with my explanation and had to go and retrieve it this afternoon. Geesh! Odd thing how easily she understood........