T.S. Spivet lives on a ranch in Montana with his mother who is obsessed with the morphology of beetles, his father (a cowboy born a hundred years too late) and his 14-year-old sister who dreams of becoming Miss America. T.S. is a 12-year-old prodigy with a passion for cartography and scientific inventions, but he is also a twin of a brother who died. He was accidentally killed and T.S. believes he is to blame for his death. One day, T.S. receives an unexpected call from the Smithsonian museum telling him that he is the winner of the very prestigious Baird prize for his discovery of the perpetual motion machine and that he is invited to a reception in his honor where he is expected to give a speech. Without telling anyone, he sets out on a freight train across the U.S.A. to reach Washington DC. Based on the novel "The Selected Works of T. S. Spivet."