One of Luce's friends. She is the adopted daughter of the headmaster and has brown hair and purple glasses. She is described as frumpy, unpopular, and has chronic allergies, but her friendship proves to be a great asset, as she has access and knowledge about Sword and Cross and shares her expertise with Luce. Penn's father used to be the grounds-keeper, but he died and was buried in the school's cemetery. She is injured while she and a small party are fleeing the battle, and later killed by Miss Sophia. Her name for 'Sword and Cross' is 'Whores and Jocks'.