The Mandrake Pact

"The prospective witch or wizard should - this can't be right," read Remus. "Is that all?" asked Sirius. "A whole month, though," lamented Peter. "Could be worse," shrugged James. As it turned out, he was quite wrong. Towards the end of fourth year, the Marauders take their first steps towards becoming animagi. The instructions are deceptively simple.