I made another circuit of the building, stubbing my toe on the same loose brick I’d hit the previous two times. Cursing, I sat on a step by the pool and listened to the night around me. For a time, I heard only the skittering of night creatures in the underbrush beyond Larchmont’s perimeter. Every now and then, a car would drive down Coverdale Lane, but no one stopped. A deer tiptoed across the lawn. When it saw me move in the moonlight, it bolted back across the meadow.

Suddenly, over the wind, I heard a louder crashing in the undergrowth beyond the garage. That wasn’t a fox or raccoon. Adrenaline rushed through my body. I jumped to my feet. The crashing stopped. Had the newcomer seen me? I tried to melt into the shrubbery lining the ornamental garden, tried not to breathe. After a moment, I heard the whicking of feet on brick: the newcomer had moved from dead leaves to walkway. Two feet, not four. A person who knew his way, coming purposefully forward.

I dropped to my belly and slithered around the pool toward the house, sticking to the paths so I wouldn’t announce myself on dead leaves. When I reached the shelter of a great beech, I cautiously lifted my head, straining at the shadows of the trees and bushes. All at once, a darker shadow appeared, ectoplasmic limbs floating and wavering in the moonlight. A slight figure, with a backpack making a hump in the silhouette, moving with the ease of youth.

I put my face back down in the turf so that moonlight wouldn’t glint from the white of my nose. The figure passed a couple of yards from my head, but didn’t pause. When I heard him at the north wall of the house, I got up and tiptoed after him. He must have seen the movement reflected in the French doors, because he whirled on his heel. Before he could bolt, I was running full tilt, tackling him around the knees. He cried out and fell underneath my weight.

It wasn’t a youth at all but a girl, with a pale narrow face and dark hair pulled back into a long braid. Her skin gave off the sour sweat of fear. I rolled away from her, but kept a strong grip on her shoulder. When she tried to break away, I tightened my hold.

“What are you doing here?” I demanded.

“What are you doing here?” she hissed, terrified but fierce. Our breath made little white puffs in the night air.

“I’m a detective. I’m following up a report of housebreakers.” “Oh, I see: you work for the pigs.” Fear muted her scorn.

“That insult was old when I was your age. Are you Patty Hearst, stealing from your fellow robber barons to give to the terrorists, or Joan of Arc, rescuing the nation?”

The moon was riding high in the sky now; its cold light shone on the girl, turning her soft young face to marble. She scowled at my mockery but didn’t rise to the bait.