House eventually discovers that Margo has been lying about several aspects of her life. She was taking her daughter’s Ritalin to maintain her "supermom" persona and secretly did not want to have more children, despite being on a demanding fertility treatment to please her husband.
The episode title, "Need to Know," also refers to the sensitive personal information characters withhold from one another. [S2E11] Need to Know
This episode marks the end of Dr. Foreman’s period of supervising House, as House officially regains control of the Diagnostics Department. Iconic Quotes and Themes House eventually discovers that Margo has been lying
House and Stacy sleep together, forcing a confrontation about their future. Although Stacy is willing to leave her husband, Mark, to be with House, he ultimately rejects her. He tells her she is better off with Mark, leading her to quit her job and leave the hospital—and New Jersey—for good. This episode marks the end of Dr