The adventure takes place in the Forgotten Realms setting, where a sinister conspiracy beyond the pristine facade of the Temple of Mystra threatens the future of Cormyr, as profane acts within the temple hearken to a mounting threat in the Vast Swamp. The player characters must cross into the Plane of Shadow to unlock the truth about this growing darkness in time to thwart an attack against Cormyr and Mystra herself.

The book is in excellent condition.