From the back:
"Designed for 4 to 6 characters of 7th to 9th level and published under the D20 system, The Hall of the Rainbow Mage challenges adventurers to solve a mystery that combines deadly dungeons and political intrigue, leading them from the village of Hampton Hill to a wizards tower with hidden laboratories, and eventually to an ancient temple. Includes numerous town, wilderness and dungeon maps as well as new monsters, spells, magic items and meta-magic feats!"