Richard performs his 10,000th surgery on a pair of bickering sisters who come into the hospital for a liver transplant; Derek and Lexie take on a neuroblastoma case that has been previously deemed inoperable; Teddy and Cristina cross the line when they go against Owen's orders and try to steal a case from Alex and Dr. McQueen; Ellis Grey's shadow looms as Meredith searches for a specialty; meanwhile Adele is brought into the hospital after she is found wandering the streets.