the official episode description for the April 11 episode of the series. That episode is extra special for two reasons: it's the show's 150th episode and Olivia Wilde returns!
Here's the scoop from FOX's press release:
Thirteen has been in prison for the past year, but the real mystery for House is what she did to get there. When she exits the prison, she is taken aback to find him waiting for her, and unaware he's got plans for the two of them for the next few days. As House probes Thirteen for more information about her crime, intent on solving the puzzle of her mysterious incarceration, they travel to an annual spud-gun competition and join forces to compete against House's much younger, overconfident rival, and along the journey uncover secrets and truths about each other. At the hospital, the team treats a science teacher suffering from severe respiratory illness, and when the team inspects the patient's house for clues to his illness, they immediately learn he's a hoarder. But upon a second visit to obtain more information, they uncover something in the many piles that shocks them. Also, Taub tries to get back into the dating scene, but winds up retreating to his old habits in the all-new "The Dig" episode of HOUSE airing Monday, April 11 (8:00-9:00 PM ET/PT) on FOX.