Linc and Izzy, sweethearts since junior high yet still unmarried, find themselves decades later with three sons, a dog, and a bungalow in a suburban backwater of Chicago. Now adolescence is about to strike their eldest, who has been directing his brothers in a mysterious project: the digging of a tunnel under their basement. Are they burrowing to deeper safety or seeking an escape? It seems a time to draw the children close for maybe the last time.

With grandparents, uncles and aunts, and a school psychologist watching for any sign of trouble, Linc and Izzy are on an ever-narrowing path. Will their love be enough to protect their boys from the larger world?