say something had felt wrong.

The pharmacy records gave us even more.

Reynolds had called in multiple altered prescriptions through a compounding service that rarely handled pediatric patients.

Security footage showed Mark picking them up.

He signed with his own name once and used initials on another visit.

Lena also pulled surveillance from my neighborhood.

On several afternoons when I had been at work, Mark entered the house carrying a paper pharmacy bag.

I watched the clips on Lena’s laptop in a conference room at the precinct and felt nausea crawl up my throat.

There he was, smiling at my camera as he unlocked my front door with the spare key I had given him because he was family.

Because I trusted him.

The next breakthrough came from a probate attorney Lena contacted after I told her about the documents Mark had pushed me to sign months earlier.

Those papers were not just basic guardianship backups.

Buried in the packet was an amendment naming Mark as successor co-trustee over Caleb’s settlement funds if I were deemed unable to manage my affairs due to emotional instability or prolonged medical hardship in the household.

Another page authorized him to coordinate with financial advisers on Caleb’s behalf.

It was drafted to look temporary but gave him broad access.

Lena also uncovered what Mark had been hiding on his own side of the ledger.

He was drowning in debt.

Credit cards maxed out.

Personal loans in collections.

Two online gambling accounts.

A second mortgage on his condo.

He had been weeks away from losing everything.

That was the motive.

He had looked at my son’s future and seen a rescue plan.

By late afternoon, the lab called.

The compounded medicine contained substances not listed on the label, including an adult heart medication and a powerful sedative in amounts no child should have been receiving.

Dr.

Shah’s face hardened when she heard the results.

‘Repeated low exposure could absolutely create weakness, fainting, stomach distress, and cardiac instability,’ she said.

‘A larger dose could be fatal.’

I stopped hearing the rest for a few seconds because blood roared in my ears.

Fatal.

Not mysterious.

Not tragic.

Not one of those cruel, random things doctors sometimes cannot stop.

My son had been killed.

Lena wanted one more piece before making the arrest.

She already had enough for warrants, but she believed Mark would panic if he thought I had found Caleb’s note and nothing else.

Panic made people careless.

So I called him.

My hands shook so badly Lena had to hit speaker for me.

Mark answered immediately.

‘Where are you?’ he asked.

No sympathy.

No grief.

Just sharp urgency.

I put tremble into my voice because I did not have to fake it.

‘I found something in Caleb’s room.’

Silence.

Then, very softly, ‘What did you find?’

‘I don’t know.

Some pages.

He wrote your name.

He wrote Dr.

Reynolds’s name.

I’m scared.’

Mark exhaled hard.

‘You’re upset.

Caleb was confused.

You know how sick he was.’

‘There was a tablet too.’

Another silence, shorter this time and dangerous.

When he spoke again, his voice had changed.

‘Listen to me.

Do not take that anywhere.

Do you understand? I’m coming over and we’ll go through it together.’

Lena wrote three words on her notepad and slid