Well, that and the surveillance equipment and escape-proof windows.

As if to make up for the imposing exterior, the glass-and-bronze entry would have done credit to a high-end hotel, an effect not lessened by the imposing reception desk. Anna gave their names to the young man behind the counter and told him they were there to see Daniel Green. He checked a list and gave them a bright smile.

“Dr. Underwood left a note that he wanted to escort you. Normally you would not be allowed in to see him at all. Daniel’s one of our special guests—that means that he can be obstreperous if he is in a mood.”

There was a hesitation before “obstreperous.” Anna would have bet that the word he’d been going to say was “dangerous.”

“It’s not Daniel’s fault.” The young man looked suddenly serious. “Dementia is a terrible thing—scary for those who suffer from it.”

The last few days had given Anna a visceral understanding of how frightening having undependable memories was. “Of course,” she said.

“If you’ll wait a moment, I’ll go get him.”

Dr. Underwood did not keep them waiting long. He was short, slender, and bearded, with warm blue eyes and a Mickey Mouse tie. He saw Anna’s glance and laughed.

“My daughter gives me ties,” he said. “She is eight. Yesterday’s tie was from Frozen. One of our clients sang ‘Do You Want to Build a Snowman?’ to me every time I checked in on her.” It didn’t sound as though it particularly bothered him.

“Daniel enjoys the gardens in the morning,” he said. “He’s more lucid outside; we find that is true of many of our clients. Indoors can feel a little alien, with strange noises and smells, but a garden is always filled with familiar things.”

He led them down a too-shiny-floored hall full of oversized solid-looking doors, most of which had dead bolts that locked the patients inside. The air smelled of cleaners that burned Anna’s sensitive nose, so it could give her no further hint of what lay beyond those doors.

“Daniel was as cheerful as he gets this morning,” Dr. Underwood said. “He had a good breakfast. I have every expectation you’ll have a good visit. But if you don’t mind, I will hover in view but out of earshot to make sure. Afterward, we should talk about Daniel’s future.”

“Of course,” Anna murmured, wondering how they were going to manage that part. Maybe she’d just give him the check and Leslie’s phone number and tell him to take it to the FBI.