Legends tell of the mysterious Harrow decks that can instantly alter a person's life - for good or for ill - or that skilled spellcasters can draw upon the Harrow's mystic power to enhance their own magic. Others speak of entire worlds created inside the Harrow, realms modeled after the exotic and frightening locales pictured in the cards and populated by strange people and stranger creatures. So when the heroes are hired to investigate a mysterious disappearance, can they survive this trip into the strangest realm yet explored in a Pathfinder world? The Harrowing is an adventure for 9th-level characters, written for the Pathfinder Roleplaying Game and compatible with the 3.5 edition of the world's oldest RPG. It also includes a brand-new monster and rules for incorporating the popular Harrow Deck (not required) directly into play, adding an exciting new level of chance into the game.