A man arrives at the ER with his daughter who is gravely injured, the leaves the ER leaving his daughter in a critical situation because her father is the only one who is a match for her blood type. Carter and Lucy alternately bicker and work well together as they try to track the father done, and put their problems behind them at the end of the day. Meanwhile, snafus involving the blood supply lead Benton to perform an unprecedented operation to save the little girl.