The original, written by Larry DiTillio and Lynn Willis, had been 160 pages, with 44 separate player handouts (newspaper clippings, handwritten letters, business cards and a matchbox).

[1] The new edition was expanded to 224 pages and had additional material provided by Geof Gillan, Kevin A. Ross, Thomas W. Phinney, Michael MacDonald, Sandy Petersen, and Penelope Love, with artwork by Lee Gibbons, Nick Smith, Tom Sullivan, and Jason Eckhardt.

[2] The book covers a campaign of sequential adventures that span the globe from New York, London, Cairo, and Kenya, to Shanghai,[3] and pits the investigators against a world-wide cult that is attempting to complete a ritual that will call Nyarlathotep, the Crawling Chaos and Outer God, to destroy the world.

[4]: 86 In the March 1997 edition of Arcane (Issue 17), Steve Faragher warned prospective referees to "Be prepared for quite a bit of work as you try to get your head around 200 pages of densely packed information.

"[6] In the July 1998 edition of Dragon (Issue #249), Ray Winninger complimented the campaign on its clarity of direction, saying, "Masks was designed in an era in which published adventures were expected to provide clear and specific instructions for running each encounter.

Whereas most modern adventures and campaigns present no more than a general blueprint for the game master to follow, Masks rarely misses an opportunity to expound upon each and every one of the options open to the players at any given moment, providing specific advice on how the Keeper might react to all of them."