Inside I placed the black lace and a short note, four lines, no venom in them, because venom was beside the point: Your wife forgot this in my husband’s car.

I thought you’d want it returned. I included the make, the model, and the license plate of the car, and nothing else.

I did not know Andrew.

I did not know whether he would rage, or weep, or refuse to believe it.

I only knew that he had a right to the truth I had, and that a woman who wanted to move carefully needed allies, and that the husband of my husband’s mistress was the one person on earth whose interests ran exactly parallel to mine.

I have thought since about how strange it was, that the first move I made was not against Mark at all, but toward a stranger — a quiet act of solidarity with the only other person being lied to the same way I was.