At the end of the 19th century, an American art student went to Paris, read a play called The King in Yellow, and lost his grip on reality. Head reeling from absinthe, bedeviled by unseen adversaries, he realized that the alien world the play described, Carcosa, had sunk its traces throughout the City of Lights. As he explored Paris in search of its decadent influence, he created a scrapbook. Yoked together from existing travelogues, newspapers, and the disquieting ephemera of the occult tradition, it laid out a skewed portrait of a haunted city. Absinthe in Carcosa is an indispensable city guide for The Yellow King Roleplaying Game.