A physical examination can identify some things, but many medications are not included in a routine screening panel.”

The words made me think of Rachel’s anxious face on our last evening together.

She was a pediatric nurse, trained to notice subtle changes in patients and to challenge errors politely but firmly.

Three nights before I found her motionless, she had been worried about a batch of medical supplies sent to the clinic.

She had stopped speaking whenever Lucas entered the kitchen, and she had asked me whether I still had the key to our locked filing cabinet.

I remembered laughing and asking if she had finally decided to organize our tax returns.