Michael and the team tracks a key card holder to a racetrack; Mahone gets caught with something priceless; Wyatt targets Agent Self; T-Bag starts to figure out Whistler's code.
House and his team scramble to find the cause of kidney and brain dysfunction in a pregnant patient, leaving the woman and her husband to face a heartbreaking choice, and Vogler continues his quest to have House fired.
Tori is suspicious when she discovers that Jade, Beck, André, Cat and Robbie are all members of the ping pong team.
Lydia and Ruben must investigate the death of a nanny as well as locate the children she tended; Ben tries to intervene with a prostitute; Tang gets an update about the boy.
Rebecca makes a shocking discovery about the Walkers and turns to her father for answers; Nora gets a phone call from a person in William's past.