At 6:17 on a Monday morning, Daniel Mercer heard something strike the stone around his swimming pool.
It was not a loud sound.
Just a tiny crack.
A sharp little noise that disappeared almost immediately beneath the hum of the pool pump.
Daniel paused halfway through pouring coffee.
He stood in the kitchen of his two-story brick house, one hand resting on the counter, listening.
Nothing.
The neighborhood outside his windows looked peaceful.
Oak trees stood along the sidewalks. Sprinklers ticked across carefully maintained lawns. A delivery truck rolled slowly toward the entrance of the subdivision.
Nothing appeared wrong.
Daniel almost ignored it.
Then he heard another sound.
Clink.
This time it came from the backyard.
He put down his coffee.
Daniel had lived in Westbrook Pines for six years. He knew every ordinary sound his house made—the furnace starting, the pool filter cycling, the wooden gate moving slightly when the wind came from the east.
This sound was different.
He walked through the sliding glass door.
The morning air was cool.
The pool looked perfectly blue.
Then he saw something shining beneath the water.
Daniel crouched beside the shallow end.
A small piece of green glass lay on the bottom.
He frowned.
He had no glass bottles in the backyard.
He did not drink beer.
His children were grown.
His sister's family had visited on Sunday, but everyone had used plastic cups.
Daniel retrieved the fragment with a pool net.
He examined it.
Jagged.
Freshly broken.
He placed it in a small plastic container and returned inside.
He might have forgotten about it.
But the next morning there were four more pieces.
On Wednesday, there were nine.
By Thursday, Daniel stopped thinking about coincidence.
Someone was putting broken glass into his pool.
And whoever was doing it knew exactly when he was away from home.
Daniel checked his security cameras.
The front driveway showed nothing.
The street camera showed nothing.
The backyard camera had a problem.
Its recording stopped every night between 1:00 and 3:00 a.m.
Daniel stared at the screen.
That was not a random technical failure.
Someone had discovered the blind spot.
He called the security company.
A technician came that afternoon.
After twenty minutes of testing, the technician shook his head.
"The camera isn't malfunctioning."
"Then what is happening?"
"Someone is interfering with the signal."
Daniel looked toward the backyard.
"Can you fix it?"
"I can replace the unit. But if somebody is intentionally disrupting it, they'll probably try again."
Daniel nodded slowly.
There was one person he immediately thought of.
Victoria Grayson.
President of the Westbrook Pines Homeowners Association.
For two years, Victoria had treated Daniel's property as if she personally owned it.
She had complained about his fence.
His driveway.
His landscaping.
His outdoor lights.
His mailbox.
Three months earlier, she had even demanded that he remove a pool safety sign because she considered it "visually inconsistent with the neighborhood aesthetic."
Daniel had refused.
Since then, their relationship had become openly hostile.
But even Victoria couldn't possibly be putting broken glass into his pool.
Could she?
Daniel looked again at the small container on his kitchen counter.
Then he opened his laptop.
He created a folder.
He named it:
POOL INCIDENTS
And beneath that, he wrote the date.
He did not know it yet, but that folder would eventually contain evidence that changed the entire neighborhood.
Friday afternoon, Daniel arrived home earlier than usual.
His office had closed early because of a scheduled electrical inspection.
He parked in the garage and immediately noticed something strange.
The side gate was open.