Today autism has become highly visible. Once you begin to look for it, you realize it is everywhere. Why? We all know the answer or think we do: there is an autism epidemic. And if it is an epidemic, then we know what must be done: lots of money must be thrown at it, detection centers must be established and explanations sought, so that the number of new cases can be brought down and the epidemic brought under control.

But can it really be so simple? This major new book offers a very different interpretation. The authors argue that the recent rise in autism should be understood...