A riveting search for the roots of terrorism by the bestselling author of The Man Without a Face. The facts of the tragedy are established: on 15 April 2013, two homemade bombs exploded near the finish line of the Boston Marathon, killing three people and wounding 264 others. The elder of the brothers implicated in the attack, Tamerlan Tsarnaev, died in the ensuing manhunt; Dzhokhar's trial got underway in early 2015. What we don't know is why. How did such a nightmare come to pass? Award-winning Russian journalist Masha Gessen draws on her unique insight and credentials to deliver a powerful story of dislocation, and the longing for clarity and identity that can reach the point of combustion. She reconstructs the struggle between assimilation and alienation that fuelled the Tsarnaev brothers' apparent metamorphosis into a new breed of homegrown terrorist, with their feet planted on American soil but their loyalties elsewhere - a split identity that seems to have incubated a deadly sense of mission.