On the same day that retired police inspector Auguste Jovert receives a letter from a woman claiming to be his daughter, he returns to his Paris apartment to find a stranger waiting for him. That stranger is a Japanese professor called Tadashi Omura. What's brought him to Jovert's doorstep is not clear, but then he begins to tell his story - a story of a fractured friendship, lost lovers, orphaned children, and a body left bleeding in the snow. As Jovert pieces together the puzzle of Omura's life, he can't help but draw parallels with his own; for he too has lead a life that's been extraordinary and dangerous - and based upon a lie.