This time, at a summer camp in California, Sarah Delashmit is a counselor. She becomes fast friends with Erin Johnson, a 23-year-old woman who was born with cerebral palsy and uses a wheelchair. Over the next decade, Erin supports Sarah, from afar, through setback after setback: a brain tumor, an Ebola infection, and multiple children born prematurely and dying. Erin mourns Sarah’s losses as if they were her own, and ultimately faces an even greater devastation.