Dr.House is being stalked by an AIDS positive man (Kalvin), who also happens to be homosexual. As the team delve into the reason behind Kalvin's sudden anaphylactic shock after he fell backwards onto a car, House attempts to get his relationship back on track with Stacy by capturing a rat which has moved into her home. Unbeknownst to Stacy, House has read her file, from her psychologists office, and is doing what he can to subtly separate Stacy and her husband Mark. This is one of my favorite house episodes, partly because of House and his wittiness, and partially because of the rat, who is named Steve McQueen by House. All in all a fantastic episode