Katherine suspected they’d been slipping small doses into her evening tea for weeks, to make her seem confused — unstable in front of her employees, her neighbors, her family.

That would justify Bradley seizing control of the design company and demanding sole custody of Tanya.

The silver key opened a safety-deposit box at a bank in downtown Phoenix. The next morning I went there with Raymond and Prosecutor Ross. I’d spent the whole night awake beside my granddaughter, listening to her breathe, sick with guilt for every time I’d waved off my daughter’s fears.

The box held three notebooks, pharmacy receipts, copies of the illegal transfers, a small tape recorder, and a sealed bag of hair. In a note, Katherine explained that she’d sent a hair sample to an independent lab.

The analysis had found a controlled sedative at levels consistent with repeated, long-term exposure.

Ross set the report aside as evidence. “This shows months of preparation,” she said grimly. “It wasn’t a domestic argument that got out of hand.”