Dr. Catherine Black, a world famous neurologist, treats patients with only the most difficult and fascinating neurological issues to solve. A brilliant doctor at the top of her field, Catherine can relate to the patients she helps because she is bipolar herself-a secret only her closest family knows. But when her boyfriend Will proposes, Catherine will be forced to confront her secret and decide if she's ready to let him see her true self. Meanwhile, she finds temptation at work in the form of sexy new neurosurgeon, Dr. Bickman. Catherine treats a boy who can't stop drawing on walls and a woman who hallucinates befriending one of Santa's elves.