Tommy's initial symptoms point to a toxin, and House believes they should treat Olivia as a suspect. However, the team confront both Tommy and Olivia and Olivia is soon ruled out.
However, the marriage is strained when Park discovers a secret room in the patient's home that is filled with guns. Tommy admits to putting it in when the house was remodelled, but Olivia didn't know about it. She soon stops visiting.
They reconcile after Tommy recovers, but Olivia insists that they move.