From the back of the box:
The Harrow deck has long been a sacred tool of Varisian fortune-tellers in the Pathfinder Chronicles campaign setting. They use this Harrow deck to tell you whether you should hope for the best or expect the worst.
With these 54 Harrow and 5 divination reference cards, you can learn to tell fortunes in any fantasy roleplaying setting. The Harrow deck also allows for a sacrilegious gambling game—a cutthroat diversion for ruffians in every port to lose their hard-earned fortunes.
Prepare to get Harrowed.
This item also has an entry on BGG: Harrow