St. Eligius' 50th anniversary spurs memories, including: it's opening in 1935 under the leadership of Father Joseph McCabe, the arrival of recently emigrated Helen Rosenthal and Mark's return as chief of surgery, Mark's bypass on Patrick O'Casey and the death of Maureen Westphall. Morrison struggles to diagnose a difficult patient and cope with the loss of Pete to a kidnapper. (thetvdb.com)