In Sickness and in Health

S3 E7: Cassie gives HARRISON BOYD – a withdrawn travelling artist - a new paintbrush, and invites him to stay at Grey House. The paintings he creates there are of things that haven’t happened yet, but invariably come true. He leaves Grey House appreciative and with his work complete – but leaving behind a cryptic painting that features everyone behaving in curious ways. Cassie also arranges for her and Sam to organize the Tri-Cities Healthfest, something that Cassie usually does by herself. Sam reluctantly agrees, though their contrasting styles are a bit of an obstacle. But they have to put the Healthfest on hold when they discover a lot of their patients and customers are experiencing the same illness, and Sam and Cassie need to work together in order to help them.