Time's arrow or the nature of the offence

In this book, Amis succeeds in rendering the shock of the Holocaust wholly new by traveling backward in time. At the end of his life, the German-born American doctor Tod T. Friendly suffers a paralysis from which emerges "the soul he should have had." This innocent soul follows "time's arrow" back through Tod's stay in America and his flight to Germany, finally arriving at the concentration camp where Friendly, as Odilo Unverdorben, served as a doctor of death. Trying to discover "when the world is going to make sense," the confused if patient soul watches as the doctor injures the healed, revives Jews who have been gassed, and grows closer to his estranged wife.