I did not open it immediately.

Adams had asked me to preserve possible evidence.

I photographed the envelope in place, left it untouched, and called him.

He arrived that evening with an evidence technician.

Watching strangers in my house was unnerving, but I wanted whatever Rachel had tried to protect to survive scrutiny.

Inside the envelope were photocopies of supply invoices, a handwritten sequence of dates and a note in her familiar looping script.

“I think someone changed the service records after inspections failed,” she had written.