Run, by Ann Patchett.
Set over a period of twenty-four hours, Run takes us from the Museum of Comparative Zoology at Harvard to a home for retired Catholic priests in downtown Boston. It shows us how worlds of privilege and poverty can coexist only blocks apart from each other, and how family can include people you've never even met.
Suspenseful and stunningly executed, Run is ultimately a novel about secrets, duty, responsibility, and the lengths we will go to protect our children.