House encounters a magician whose heart failed while performing an underwater escape act. While the remaining fellowship candidates work to diagnose the illusionist, House is determined to prove that he's a scam artist faking his ailments to cover up the fact that he nearly drowned during his act. During the testing, House suspects one of his own candidates may have an undisclosed illness. In the meantime, House pits his team against one another in a challenge involving Cuddy, granting the winner immunity from elimination and a chance to nominate two other candidates to be put on the chopping block.