It is not self-evident.

It is only self-evident to you.

To everyone else it is a story, and stories get rewritten by whoever is most willing to tell them, unless someone has quietly kept the dates.

Chapter 12 — That Is Usually How Evidence Starts

The parents did not come the following weekend either, though they had let Lily believe they might, and this time I did not look toward the driveway at all.

That evening, after she was in bed, I went around the quiet house with my phone and I photographed things.