From the back of the book: - Characters encounter altered ones and living metal while searching the hostile wilderness for hidden secrets of the ancients! - They try to penetrate the blue man's renegade Iron Society enclave to uncover the mystery of the Yorkum Turkel. - This adventure for the new 4th Edition GAMMA WORLD game is designed for three to six characters of 1st to 3rd level. - Mutant Master is an excellent tool for beginning a new GAMMA WORLD campaign, either based in Ascension in Gamma Terra, or adapted into a GM's personally designed world. - It is recommended that the character group have at least one Altered Human. Note: Front cover incorrectly says "Game Rules" under the GAMMA WORLD logo, should say "Adventure."