Mary Mouse is a fictional character "imagined" by Enid Blyton, a prolific British children's author, in the mid 20th century. Mary Mouse is a mouse exiled from her hole who becomes a maid at the dolls' house, employed by Sailor Doll. Loved mainly by girls, this character's memory has lived on. The original books are highly collectable, perhaps because few remain in reasonable condition. The books were immensely popular in Blyton's days and eventually sold in a million copies.