I took it, at the time, as simple grief for a brother he had loved, and it was that, but it was also something heavier that I had no way of naming then.

A person carrying a secret guilt grieves differently from a person carrying only loss.

The grief curdles.

It turns inward and sours.

I mistook the particular shape of Zachary’s suffering for the ordinary kind, because I had no reason yet to look for the other kind, and because he was very good, for six years, at not being looked at too closely.

But there was one subject that changed him.