Brendan Michael Coughlin

The doctors form two teams to operate on conjoined twins; Bailey uses Meredith as a buffer between her and Ben; Alex learns a tough lesson; Teddy asks Cristina about Henry's surgery.

Jane and Maura are brought into the world of Keltic writings by the murder of a rare bookseller, Maura prepares Jane to meet her new man, and Angela's relationship with Cavanaugh changes.

The Red Cell team must track down a suspect who is kidnapping young mothers. Meanwhile, Beth discovers why this particular case hits close to home for Mick.

The team investigate when a mob of hooded criminals terrorise the city by surrounding and beating up tourists. When Greg intervenes in one of the attacks, he becomes the gang's next victim, and his brave actions have unforeseen and tragic consequences.

House is bemused to encounter a patient with no memory, who mimics the personalities of everybody he meets. Foreman returns to the hospital to supervise the applicants, leading to a battle of wills between House and Cuddy.