This is the 20th instalment of Lee Child's American odyssey. He has earned the right to play with our expectations and does so with glee. The deadly secret — something to do with GM crops, perhaps? — leads Reacher and Chang to Los Angeles, Phoenix, Chicago and San Francisco, hunted all the while by some scary Ukrainians. Remember Little Joey, the Essex gangster in Personal, whose head was "bigger than a basketball"? Here the Mr Big, who owns a nightclub called Pink, is "an undifferentiated triangle of flesh, with breasts the size of soft basketballs".