From the introduction: Frozen in Frostmarch is intended for four characters with an average party level (APL) of 5. Characters who complete this adventure should earn enough experience to reach halfway to 6th-level. A boy and his uncle have gone missing in the frozen wastes of the north. This campaign takes place in Arden, although it can be set in your own world. Any party composition should be able to finish the adventure with intelligent play.