From the introduction: The Cherry Blossom Killer 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. An unknown assassin is killing the city's elite and now a noble fears for his life. 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.