“Certainly, Doctor, if you’ll come this way,” the nurse said, glanced back at me once, then started to walk briskly across the foyer. Dr. Birnbaum motioned quickly for me to follow him into the building. I needed no second urging and slipped into the cool darkness of the marble foyer. The nurse continued up the stairs, her back to me. Dr. Birnbaum followed her. I waited just inside the front door, my heart pounding, not sure what to do next. Find out which room Bess was in, obviously. It wasn’t a very large building. It shouldn’t be too hard. There would probably be some kind of office or command center in which the patients were listed, but I ran the risk of bumping into another nurse there. It was also possible that the patients’ names were on their doors.

I crept up the first flight of stairs and saw plain wood doors adorned with no nameplates. The landing was pleasingly furnished with bright pictures on the walls, wicker rocking chairs, and a large potted plant—more like a hotel than a clinic.

On the floor above me I heard a door open, and men’s voices: Dr. Birnbaum had obviously met Dr. Asher. Then the door closed and I could hear the voices no longer. They were both safely occupied in a patient’s room. That left only the dragon woman to be outsmarted. Sure enough, I heard light tapping of feet coming across the floor above me, then starting to come down the stairs. I ducked behind the potted plant. The nurse passed me, her starched skirts almost brushing my bare arm. I held my breath but she continued down to the ground floor, then I heard the sound of a door closing. I was safe for a moment. Cautiously I opened one door after another. Some rooms were empty, some contained sleeping patients. One contained an old lady who sat up excitedly as I came in. “For heaven’s sakes!” she exclaimed. “What are you doing on this train, Mabel?”

I gave her an encouraging wave and hastily retreated again. Then I tiptoed up the next flight of stairs to the third floor. There was a broad skylight in the middle of the ceiling, sending rainbow colors onto the polished wood floor below. If Mrs. Houdini was supposed to have quiet, then her room would surely be at the back of the building. The second door I tried revealed a small, dark head curled up amid white sheets. What’s more, she was alone. I heaved a sigh of relief, slipped inside, and closed the door behind me. Bess didn’t stir. Then, of course, it occurred to me that sedation means sedation. She might remain asleep all day and I was wasting my time.