Corday discovers that her mother and David Greene spent the night together. Greene later discovers that his father has lung cancer. Lucy's mother visits the ER to empty her daughter's locker and pay a visit to Carter, who is regaining strength and recovering. Abby goes behind Weaver's back with a patient on a gut instinct. Luka witnesses a hit-and-run accident and rushes the victim to the ER in a plumber's truck. Carol must tell a promiscuous 14-year-old that she has cervical cancer.