Dr Paul Allen is a highly respected rheumatologist living in a comfortable suburb with his second wife and their two young boys. And then one evening America is rocked by the shooting of a charismatic Presidential candidate and the young man arrested for the crime is Danny, the child of Allen's first marriage - news which sends the family down a harrowing path of no return. Almost overwhelmed by a vortex of feelings - guilt, anger, incredulity, love - Allen embarks on a mission to understand what happened and why. Even if he is the only man in the world who believes in Danny's innocence, he is determined to prove it. At the same time, he is forced to look back at the past, and Danny's childhood. Following the trail of his son's fatal last journey across America, Allen's quest is both a suspenseful drama and a searing meditation on conspiracy theory, gun culture, marriage and parenthood.