Temple of the Winds (Sword of Truth Series #4)

Jagang, Emperor of the Imperial Order, has invoked a bound fork prophecy binding Richard and Kahlan to a fate of pain, betrayal, and a path to the Underworld. At Jagang's behest a Sister of the Dark gains access into the fabled Temple of the Winds and has unleashed a plague that sweeps across the lands like a firestorm consuming lives at an alarming rate. To stop the plague Richard and Kahlan are forced to sacrifice everything they have between them.