Brenda knew all of that.

She had attended a neighborhood picnic where Evelyn explained the program, although she later pretended the conversation had never happened.

What Mark knew was far less clear.

He and his mother had become estranged after years of arguments about the flood, his father’s reaction to it, and whether the family should keep reopening the painful subject.

Brenda had told him the trust had closed.

She had told our neighbors the pool was under a neighborhood improvement agreement.

Both statements were false, and until that afternoon I had not realized just how conveniently they supported each other.

Brenda’s campaign began in February with a cream-colored envelope placed inside my storm door.

It contained a notice about “unauthorized aquatic amenities” and demanded that I attend a compliance meeting at her house.

There was no homeowners association on Briar Lane.

A voluntary garden club had met there years earlier, but it collected money for seasonal flowers rather than policing private yards.

Brenda had become the self-appointed chair of something she called the Briar Lane Community Standards Committee.

She printed its initials on letterhead and introduced herself to newcomers as if she held a municipal appointment.

My first reply was polite.

I told her the pool met local requirements, offered the permit record, and explained that supervised classes took place only by reservation with a certified instructor.

She came to my door the next morning wearing a white visor and carrying a clipboard.

“People don’t like surprises,” she announced.

“Then people can ask questions,” I said.

“You are turning this into a business.”

“No one pays to attend the trust’s classes.”

“That hardly seems fair to the rest of the street.”

I asked what fairness had to do with private property.

She looked over my shoulder toward the pool and said that residents deserved access to neighborhood amenities.

“It’s a private pool with a narrow educational purpose,” I explained.

“It is not an amenity the street owns.”

She wrote something on her clipboard without looking at me.

A week later she delivered an invoice for two hundred and fifty dollars in alleged nuisance fees.

The invoice had no legal authority, no governing document, and a payment address at a post office box near the grocery store.

I photographed it and saved the original.

I did not pay it.

Her next notice accused me of violating a noise rule even though the pool had been covered for the previous three weeks.