House and his team make unexpected discoveries about a female patient admitted to the hospital after severe and uncontrollable vomiting; House and Cuddy are forced to face the reservations in their relationship after a visit from a massage therapist.

When an infant suffers breathing trouble and liver failure, House and the team must look at the medical history of the mother in order to find an answer, and ultimately land on a discovery that forces the mother to jeopardize not only her child's health but her own. Meanwhile Taub and Foreman must find a new female doctor to fill the spot vacated by Thirteen and House and Wilson learn a thing or two about parenting while caring for Cuddy's daughter.

After saving a stranger who fell onto subway tracks, a man suddenly collapses despite appearing to be unscathed; House tries to avoid a dinner with Cuddy and her opinionated mother.

When House discovers that the experimental drug he's been using causes fatal tumors, he decides to attempt to excise them himself. However, he can't complete the surgery and ends up needing Cuddy's help. Meanwhile, Thirteen's friend from prison (Amy Landecker), a relapsed drug user, arrives at her apartment needing medical care after being stabbed. With her friend unwilling to go to the hospital, Thirteen enlists Chase's assistance when the friend loses sensation and movement in her arm. Also, Taub receives some unexpected news that could change his life.