It was a key.
Not a mechanical one.
A marker showing exactly which stone concealed the entrance.
Someone at San Aurelio had found Nathaniel's old notes, learned a marker existed, then spent months searching the northern camps for it.
Mara had discovered the disk after San Aurelio men dropped it while attacking her survey group.
They had nearly killed her over something she did not understand.
Until she reached Ward Ranch.
The final evidence came from a man named Lewis Crane.
Crane managed San Aurelio's field crews.
Sheriff Reed arrested him after another employee admitted Crane ordered men to frighten Apache travelers away from the springs.
Not kill them.
That distinction mattered to Crane.
It mattered less to the people he had shot at.
Crane eventually talked.
Barton had created a simple strategy.
Reduce water.
Spread stories of raids.
Encourage frightened ranchers to sell.
Buy land before a planned railroad branch became public.
Then reopen or redirect water after San Aurelio owned enough property.
"Fear sells land cheaper than drought," Crane said.
Elias stared at him across the sheriff's desk.
"And my ranch?"
Crane hesitated.
"Barton needed the well."
"Why?"
"Because every engineer said the deepest stable access point was under your place."
Elias thought of his father.
"And seventeen years ago?"
Crane looked away.
"I wasn't working for him."
"Do you know how Nathaniel Ward died?"
"No."
It was not the answer Elias wanted.
But it was the truth.
They never proved Barton murdered Nathaniel.
A retired stable worker testified that Barton's horse had been missing the night Nathaniel died.
Another remembered the two men arguing.
None of it proved murder.
Barton was eventually charged with conspiracy, fraud, intimidation, falsifying survey records, unlawful blasting, and interfering with established water use.
But not Nathaniel Ward's death.
Elias struggled with that.
One evening he sat beside the well after everyone had gone.
Mara joined him.
"He killed him," Elias said.
"Maybe."
"I know it."
"You believe it."
Elias looked at her.
"There's a difference?"
"Yes."
He hated that she was right.
"My father deserves the truth."
"Then do not replace missing truth with something easier."
Elias leaned against the stone.
"You always this irritating?"
"Yes."
"Good to know."
She smiled.
The hundreds of riders gradually left the valley.
Their arrival became a story before the facts could catch up.
Newspapers in Tucson printed exaggerated versions.
One headline claimed Elias Ward had faced "an Apache army."
Another claimed Mara was seven feet tall.
She found that particularly funny.
"Seven feet?"
Elias poured coffee.
"You did look taller when I first found you."
"I was sitting."
"Exactly."
She stared at him.
"That makes no sense."
"I was dehydrated too."
"You were not."
"I was emotionally dehydrated."
Mara laughed so suddenly that coffee nearly spilled from her cup.
It was the first time Elias heard her laugh without restraint.