Your Face In Mine by Jess Row

One afternoon, not long after Kelly Thorndike has moved back to his hometown of Baltimore, an African American man he doesn't recognize calls out to him. To Kelly’s shock, the man identifies himself as Martin, who was one of Kelly’s closest friends ... . Martin then tells an astonishing story: after years of immersing himself in black culture, he’s had a plastic surgeon perform “racial reassignment surgery”: altering his hair, skin, and physiognomy to allow him to pass as African American.