The mistake was discovered on a Tuesday.
Which somehow made it worse.
Not during a crisis.
Not during an invasion.
Not during one of the countless world-ending events the Justice League dealt with every year.
Just—
A Tuesday.
Inside the Batcomputer, files scrolled across the screen as Batman reviewed an old case.
Routine verification.
Cross-referencing records.
Nothing unusual.
Until something didn’t match.
Then another thing.
Then another.
For several long seconds, the cave was silent.
Batman stared.
The computer stared.
Everyone’s future headaches quietly materialized.
“That’s impossible.”
Across the cave, Superman looked over.
“What is?”
Batman didn’t answer immediately.
Because he was busy hoping he was wrong.
The deeper he dug, the worse it became.
DNA records.
Medical evaluations.
Arrest reports.
Psychological assessments.
Everything connected.
Everything verified.
Everything pointed toward the same horrifying conclusion.
Years ago, authorities had arrested one of a pair of identical twins.
The problem?
They arrested the wrong one.
Silence filled the cave.
Nobody moved.
Nobody breathed.
Because that wasn’t just a mistake.
That was a catastrophe.
The file remained open on the screen.
Years.
Not days.
Not weeks.
Years.
The innocent twin had spent all of them inside Arkham Asylum.
While the guilty one had remained free.
Batman looked physically ill.
Which was an achievement.
Across the room, Wonder Woman folded her arms.
“Tell me that’s not what I think it is.”
Batman remained silent.
That was answer enough.
The room somehow became even quieter.
Because villains escaped Arkham all the time.
That was expected.
This?
This was different.
This wasn’t a security failure.
This wasn’t a supervillain attack.
This was an innocent person losing years of their life because nobody looked closely enough.
Finally, Superman broke the silence.
“…Does she know?”
Batman looked down at the file.
At the dates.
At the reports.
At the years.
Then toward the security feed showing a woman sitting quietly in a cell she should never have occupied.
His expression hardened.
“No.”
A pause.
The kind that made everyone uncomfortable.
Then Batman stood.
“We’re going to tell her.”
Nobody argued.
Because after years of believing herself forgotten—
The least she deserved was the truth.