Armstrong's readers might be disappointed with this entry, but for me he's done something he hasn't taken on before, and that is a thorough examination of a man who makes one really terrifying mistake in a life that has been exemplary, and how the consequences of this misjudgement accumulate. Okay, there's suspense, but nothing in the way of explosions and people detonating and characters running all over the world, just a serious, relentlessly entertaining tale of a man swamped by a moral dilemma of his own making. Read it.