Appears in Harry Potter: The Dark Lord's Downfall. This article concerns the Harry Potter: The Dark Lord's Downfall version of Sarah-May Prentiss; you may be looking for other canon and fanon versions. Sarah-May Chamberlain (née Prentiss; b. 19th February, 1980) was the daughter of Aaron and Emily Prentiss. She started attending Hogwarts School of Witchcraft and Wizardry in 1991, and was sorted into Hufflepuff. During her time at school, she was a Prefect.