Challenge of Druid's Grove is the fourth One-on-One Adventure Gamebook, and involves a race between the representatives of two different factions who are trying to capture each other for ransom while trying to stop a growing evil in the forest of Laith. There are two books in the box set, one for the player of the wizard Ar-Kane and one for the player of the druid Renwood. Players move their characters from location to location, collect items, come into conflict. An "Advanced Dungeons & Dragons Adventure".