From the Back of the Book:
For a long time you have heard legends about the Island Vacros; when you were only a child, the stories about evil minotaurs were used to scare you into behaving. Now you are grown, and you no longer believe children's stories.
But King Trueon of Cathos is worried: his daughter Princess Lydora has been kidnapped, and he has found clues that she has been taken to the ancient and evil island of Vacros. You have heard rumors tht a large and dangerous mazework lies beneath the surface of this island--a mazework that is guarded by false minotaurs. Of course many rumors are false, but then again...
The Maze of the Riddling Minotaur is the second in a series of invisible ink modules: using the invisible ink pen included in this module, you may play the adventure by yourself. After you have played the solo version, you have not used up the module: instructions are provided as to how you may change the solo version into an exciting group adventure!
Note: This module is sometimes referred to as "MSOLO2" to distinguish it from the other M2 ("Vengeance of Alphaks").