From the back cover:
The Bell of Ibyn Never Tolled.
And so the covenant fell. The wondrous bell warned the mai of all dangers, or so the wizards of Calebais thought. But fifty long years ago some dark force destroyed their beautiful covenant, and its opulent halls have remained untouched ever since. Until now. Into your hands has fallen a document that hints at how to pierce the protective Veil of Riddles, and you have an opportunity denied to all wizards before you: to explore the covenant of Calebais, to loot its treasures, and to solve its mysteries. But how did Calebais fall, and does the danger lurk there even yet?