As I started up, he began to retreat, his big eyes not wavering from my face. The staircase ended in a large open area with skylights overhead. So this was where light seeped out for Geraldine Graham to see. When Catherine came, she and the boy sat talking by flashlight or something. I switched off my headlamp-I hoped before Geraldine noticed it.

The roof was pitched steeply here. Odd corners stuck out into the room to accommodate the house’s four chimneys. This had been the servants’ common room during Geraldine Graham’s childhood. I pictured a wistful girl with dark braids sneaking up the stairs to watch the maids play poker.

Old furniture was piled against one of the walls-I made out a couple of dressers, a jumble of chairs and a bed frame. The boy and Catherine must have dragged out the leather-topped desk that stood directly under the skylights. Some books were stacked neatly along one side next to a plate, cup and glass. I assumed the desk and the rest were Graham family discards-they looked too old to have been part of the nou-nou family’s brief tenure.

The boy’s eyes darted from me to the stairwell; he was trying to summon his courage to make a break for it.

“You can run down the stairs and out the doors.” I kept my tone level, even friendly: good cop. “I won’t try to stop you. But you won’t get far, especially not without Catherine to guide you over the ground.”

He slumped on the top step, his head on his knees, forearms pressed against his ears, so desolate that my heart was touched. Instead of Catherine, his one friend, whom he’d been longing for, he’d gotten me.

I walked over to the north wall, which overlooked the back gardens. The windows were small and set up high, but he had moved a chair over so he could stand and see out. I climbed up. From here, you could watch for someone to appear around the corner of the garage. You could spend long lonely nights on this chair hoping she had gotten away from Chicago to come see you. You could also see the pond.

I climbed down and explored the rest of the attic. The common room led to a short wide hall with six monastic bedrooms and a Spartan bathroom. I turned the taps; cold water came out. At least he could use the plumbing. A mattress with a sleeping bag on it was set up in one of the rooms; his few clothes were neatly folded on yet another chair. A couple of flashlights and a box of batteries stood next to the bed.

When I came back to the large room, he was still sitting on the top stair, head on his knees.

“Who are you? Why are you hiding here?” I asked. He didn’t answer me, didn’t move his head.

“It’s cold up here. You probably haven’t had a proper meal in-however long it’s been. Come on with me and tell me about it.”