Meredith and Derek update their wills and healthcare directives when Meredith tests positive for several genetic markers of Alzheimer's. The attendings train two Syrian doctors in performing lifesaving surgeries in the field without much modern equipment, anesthesia or electricity. Derek recognizes that Heather has potential for neurosurgery and focuses on teaching her, much to Shane's chagrin. Owen continues to spend time with the boy whose parents are still in critical condition following the gas tanker crash. Two of Dr. Bailey's patients present with post-op infections; while she initially blames Leah, when a third patient presents with the same infection, it ultimately shows that Bailey was the only one who had contact with all of them.