Snape's Last Request

When she foolishly decides to place a wager against Professor Slughorn for the best Halloween Fright prank, Hermione finds out that that she may have bitten off more than she can chew. When she enters a disused storeroom frantically searching for ideas, though, she finds something worth far more than ten Galleons. But first, she will have to brew a special batch of PolyJuice...