Cassie sleeps as lightly and easily as a kitten; after a few seconds I heard her breathing slow and deepen, the tiny catch at the top of each breath that told me she had drifted off. I am the opposite: once I'm asleep it takes an extra-loud alarm clock or a kick in the shins to wake me, but it can be hours of tossing and fidgeting before I get there. But somehow I always found it easier to sleep at Cassie's, in spite of the lumpy, too-short sofa and the grouchy creaks and ticks of an old house settling for the night. Even now, when I'm having trouble falling asleep, I try to imagine myself back on that sofa: the soft, worn flannel of the duvet cover against my cheek, a spicy tang of hot whiskey still warming the air, the tiny rustles of Cassie dreaming across the room.
A couple of people clattered into the house, shushing each other and giggling, and went into the flat downstairs; peaks of conversation and laughter filtered up, faint and muffled, through the floor. I matched the rhythm of my breathing to Cassie's and felt my mind sliding pleasurably down into dreamy, nonsensical tangents-Sam was explaining how to build a boat, and Cassie was sitting on a window ledge between two stone gargoyles and laughing. The sea is several streets away and there was no way I could have heard it, but I imagined I did all the same.
In my memory, we spent a million nights in Cassie's flat, the three of us. The investigation only lasted a month or so, and I'm sure there must have been days when one or another of us was off doing something else; but over time those evenings have colored the whole season for me, like a brilliant dye flowering slowly through water. The weather dipped in and out of an early, bitter autumn; wind whined through the eaves, and raindrops seeped in the warped sash windows and trickled down the panes. Cassie would light a fire and we would all spread out our notes on the floor and bat theories back and forth, then take turns getting dinner-mainly pasta variations from Cassie, steak sandwiches from me, surprisingly exotic experiments from Sam: lavish tacos, some Thai thing with spicy peanut sauce. We would have wine with dinner, move on to whiskey in various forms afterwards; when we started to get tipsy, we would pack the case file away and kick off our shoes and put on music and talk.
Cassie, like me, is an only child, and we were both enthralled by Sam's stories about his childhood-four brothers and three sisters piled into an old white farmhouse in Galway, playing mile-wide games of Cowboys and Indians and sneaking out at night to explore the haunted mill, with a big quiet father and a mother dealing out oven-warm bread and raps with a wooden spoon and counting heads at mealtimes to make sure nobody had fallen into the stream. Cassie's parents died in a car crash when she was five, and she was brought up by a gentle, older aunt and uncle, in a ramshackle house in Wicklow, miles from anything. She talks about reading unsuitable books from their library-
