Martha Hatter is Sophie Hatter's 15 year old sister
. It is said that the youngest of three is the one who will make their fortune in life, so Martha was considered blessed by birth. She is slender and fair with big grey eyes, but known to be the smartest of the three Hatter sisters. As such, Fanny arranges her to become Mrs. Fairfax's apprentice, though Martha and Lettie Hatter switch appearances temporarily in order to switch places. Martha happily works as an apprentice Cesari's, a renowned pastry shop, and her ambition is to get married and have ten children. She loves Michael Fisher and the two are planning to get married after their apprenticeships are finished.