Episode 21: Saviors: House worries he's lost his mojo when he can neither determine the reason for Cameron and Wilson's changed behaviour nor diagnose a new patient.
Episode 22: House Divided: House's Amber hallucination becomes more aggressive as sleep deprivation takes its toll. Meanwhile Chase's bachelor party ends in the emergency room.
Episode 23: Under My Skin: After all of House's efforts to rid himself of Amber fail he turns to someone unexpected for assistance. Meanwhile the team is left to fend for itself as they try to save a ballerina's life.
Episode 24: Both Sides Now: House and his team treat a patient who had his brain split in half; now it seems like one side of his brain is causing some health/behavioral issues. House plays games with Cuddy over the night he detoxed. Cameron and Chase come to a decision.