Mansions of Madness, softback adventures for Call of Cthulhu 1920s, by DeWolfe, Martin, Morrison, Herber, Behrendt, Love, Routt, Gibbons, Ingersoll, Gulisio, Inabinet
“MANSIONS OF MADNESS is a new collection of five independent tales set in the 1920s. Of varying length and complexity, these adventures can be planted into an ongoing campaign as the keeper sees fit. Some can be played in a single night; others will require several nights to complete. They can readily be used as plot twists, interesting diversions, or red herrings.”
The VERY GOOD copy is the original 1990 edition.