Episode 400

Caitlin is upset when the doctor tells her that the only thing that can save Trey was blood from his biological mother, and that blood from anyone else would kill him. Annie comes up with a plan. First, she tells Caitlin that Trey's biological mother will be willing to give blood for Trey's sake. Then she tells Olivia that if she donates the blood anonymously, everyone wins -- Gregory will never find out that Trey could be Cole's son, Caitlin will never find out that Trey's really her brother, and Cole will never find out that Trey isn't Caitlin's biological son. Olivia refuses to go along with this plan. Caitlin confesses to Olivia that Trey isn't her biological son, then breaks down into tears. Gabi tells Meg about Sara's disappearance.