Familiars and Masters is the first (mini-)expansion for the dice-cardgame Monsters of London. It expands the game by 8 cards, introducing new powerful PERMANENT abilities. The four Masters, who created the monsters released into the streets of Victorian London, join the battle: Worth four Pounds when captured their permanent abilities may soon become quite a nuisance. It's quite the other way around with the Familiars: Their helpful abilities support the player but cost one precious Pound Sterling at the end of the game.