I have thought, many times since, about my father’s lesson — the one that surfaced in me on that kitchen floor and governed everything I did afterward. Never show a thief which lock still works.

He gave it to me years before, and I had taken it, at the time, as ordinary practical caution, the kind of thing a careful man says about home security.

I did not understand, until I needed it, how deep it went, or that it was really a lesson about people.

Because the hardest thing I did in those six months was not gathering the evidence.

It was staying quiet — enduring Derek’s tenderness, and Sylvia’s visits, and the endless pressure, and the sheer daily indignity of letting them believe they had beaten me, when everything in me wanted to throw the truth in their faces and watch them break.