Kyra Da Costa

Maggie and Meredith disagree with Derek about the best way to approach a patient's case, which leads to a bigger argument between the couple. Meanwhile, Callie feels responsible when one of her veterans is pushed too far and one doctor's routine procedure results in a devastating diagnosis, on the winter finale.

House encounters Nate, a teenage chess player who is overcome with violent rage and pounding headaches. Meanwhile, Foreman is furious to learn that somebody has cancelled his job interview at another hospital, and wastes no time in blaming House.