The Evil of Castle Cardinal

From the introduction: The King’s Forest. Ever since the end of the Goblin War the place has been host to countless orcs, disrupting the flow of trade between Suzail and Arabel. That changed when adventurers claimed an abandoned keep within the forest and ensured safe passage for travelers skirting the woods. When rumors that the keep stands abandoned once more, a call for adventurers was sent, and you answered... A 4-hour adventure for 4th-5th level characters