Julian Glen, a talented up-and-coming playwright, has penned a work that he claims will be his masterpiece. There's only one problem...it's turning its audience into mindless fanatics! As some of the few audience members to retain your sanity, you and the other investigators must now work together to find Glen and uncover his true plot.

Mansions of Madness: The Yellow Sign is a print-on-demand story expansion for Mansions of Madness. Based on a design by a collaboration of fans at FFG's Arkham Nights 2011, The Yellow Sign thrusts players into a house filled with deranged actors. Can you survive until your next curtain call?