Sociology professor Matthew Larkin is barely holding on. After the death of his toddler son, his wife divorced him, his teenage daughter abandoned him, and he lost a job he loved. Landing a rare tenure track position at a small college in southern Minnesota, he's trying to cope with the disaster his life has become.

While driving down an empty highway in the middle of nowhere one gloomy Sunday evening, Matthew gets caught in a hailstorm. Pulling off the road to find shelter, he spies a disturbing sight. Caught in the car's headlights is a child curled up beneath a plastic tarp. The boy is alive but unconscious, soaked to the bone and possibly hypothermic. Knowing an ambulance would take too long to reach them, Matthew impulsively puts the boy in his car, intending to get medical help.

On the way, the boy awakens and becomes agitated, begging Matthew not to take him to a hospital or to call the police. Matthew sympathizes with the panicked boy, who looks to be the same age his son would have been. Overcome by longing, grief, and a need to make sense of everything that's happened to him, Matthew makes a dangerous choice--risking everything for a chance to face his past, move on from the pain, and forgive both his family and himself.