The Missing Princess of Thornfall

From the introduction: The Dark Ravens Adventurers guild never turns down a desperate lord and lady in need of finding their missing daughter. Your group finds themselves following up such a contract in the town of Thornfall. She apparently was last seen playing near the village wall. Did she stray over the wall and get lost, was she kidnapped by a rival lord for ransom, or did something darker come out of the woods to claim an innocent life? Your party must find out.