From publisher blurb:
Citadel of Serpents is the largest and most challenging Monsters! Monsters! solo adventure ever written (yet). The adventurer is challenged to outwit an undead sorceress queen from the ancient past. Originally created as for Ken's other rpg system by English master scenario designer A. R. Holmes, Ken has completely redone it to place it solidly within the new Monsters! Monsters! u niverse on the planet Zimrala, deepening and expanding the planetary history and the scope of the M!M! rule set. Ken has also modified the game to allow it to be played (by an experieced and confident) Game Master as a face-to face tabletop adventure for high level characters. Profusely illustrated, Citadel of Serpents is Ken's longest and most challenging solo adventure,