I still didn’t know anything about what had happened to this teenager. Had she given birth alone and left the baby in a gas station bathroom? Had her child been snatched?

We couldn’t even get the FBI involved until we knew if a crime had been committed.

While I sat at Avis’s bedside, Conklin went back to the Hall and threw himself into the hands-on work of the case. He reached into the missing persons databases and ran searches for Avis Richardson or any missing Caucasian teenage girls matching her description.

He interviewed the couple who had brought Avis to the hospital and established the approximate area where they had found her: Lake Merced, near Brotherhood Way.

Working with the K-9 unit, Conklin went out into the field. Cops and hounds looked for the blood trail that Avis Richardson had surely left behind. If the house where she’d given birth could be located, there’d be evidence there, and maybe the truth.

As the hounds worked the scent, the crime lab processed the plastic poncho Avis had been wearing. It would hold prints, for sure, but a few dozen people at the hospital had handled that poncho. It didn’t make any sense that she was wearing a rain poncho but no clothes.

Another mystery.

I kept vigil with a sleeping Avis. And the longer I sat, the more depressed I became. Where were the worried friends and parents? Why wasn’t someone looking for this young girl?

Her eyelids fluttered.

“Avis?” I said.

“Huh,” she answered. Then she closed her eyes again.

I took a break at around four in the afternoon, pushed dollar bills into a vending machine, and ate something with peanut butter and oats in it. Washed it down with a cup of bitter coffee.

I contacted a dozen hospitals to see if a motherless baby had been brought in and got in touch with Child Protective Services as well. I came up with nothing more than a mounting heap of frustration.