From the Back of the Book:
The Moonsea - a perilous frontier ruled by tyrants and threatened by monsters. Here, cities consumed by decadence and war rise and fall like the sun, and conspiracies abound. Greate adventure awaits those who oppose evil, for the Moonsea is rife with it. The Mysteries of the Moonsea accessory contains 37 loosely connected adventures that can be run individually or linked to form the basis of an entire Forgotten Realms campaign. In addition to the adventures, this book presents maps and descriptions of the major Moonsea cities of Melvaunt, Hillsfar, Mulmaster, and Zhentil Keep, as well as statistics and descriptions for 15 important campaign villains.