Madam was a white she-cat of the British Shorthair breed with a beautiful bright white fur, a pink nose and two orange eyes. She only appears in the sixth novel called Schandtat. She was a young member of the community of Underground cats and lived there with Francis a domestic cat who lives in the neightbourhood with a human named Gustav Lobel, Eloi and then all the other cats. Madam and Francis turned into lovers and she was the first female that Francis mated with.
Their meetings were centered around passion and desire and Francis learned how sharp the claws of a female can be after mating. As a result, she became pregnant with Francis' first litter.
Madam, as the other cats in the community, was a murder victim of the mysterious mass murdering. Francis was shocked to find her body being murdered and her memory remained dug deeply into his mind.
Years later, Junior explores the Underground cave where the cats lived and makes a disturbing discovery of the bones of Madam with also the small bones of an unborn cross-breed kits (her half-kins).
Madam (the very first ever mate of Francis) is killed alongside with all the other cats of the community, and with the exclusion of Francis. Eloi, a male Siamese cat is also believed to have been one of the murder victims.