"Imbalanced humours. Earth, air, fire and water. How do imbalanced humours become so?" he turned to study the faces of Odo, Charlotte and Petrus. They all shook their heads. "The balance here at Mellester is good, so from whence does it come?"

"From the wind?" volunteered Charlotte.

"Aye, and that is what I thought."

"Wind?" Odo repeated. "How about water?"

"Aye, even water," Cathal responded. He leaned forward. "I'm told the wind comes from the ...