Lawrence departs (but not before saving a life), and Kovac comes aboard full time after earning Kerry's respect. Corday discovers her new trauma patient is a rapist and takes extreme measures to find his latest victim. Carol and the drug-using teen have a confrontation. Carter angles for more responsibility inside the ER. Greene's father was due to fly into Chicago but doesn't show up for hours after his scheduled arrival time. And the Bright Star Gospel Choir is rushed to the ER.