Rivers of London RPGDescriptionSpecificationsShipping I think becoming a wizard is about discovering what's real and what isn't. Ben Aaronovitch, Rivers of London In Rivers of London: the Roleplaying Game, players take on the roles of newly recruited members of the London Metropolitan Police Services special magic branch, aka the Folly. You will solve mysteries, catch criminals, and come to grips with the demi mondethose who have been irreversibly changed by magic.