Excerpt from The Girl on the Train by Paula Hawkins, plus links to reviews, author biography & more

Or rather, it's awkward when I see her. Tom just ignores me. But Anna seems to take things personally. She obviously thinks that my short-lived career as a nanny came to an end because of her or because of her child. It actually wasn't about her child at all, although the fact that the child never stops whinging did make her hard to love. It's all so much more complicated, but of course I can't explain that to her. Anyway. That's one of the reasons I've been shutting myself away, I suppose, because I don't want to see the Watsons. Part of me hopes they'll just move. I know she doesn't like being here: she hates that house, hates living among his ex-wife's things, hates the trains.

I stop at the corner and peer into the underpass. That smell of cold and damp always sends a little shiver down my spine, it's like turning over a rock to see what's underneath: moss and worms and earth. It reminds me of playing in the garden as a child, looking for frogs by the pond with Ben. I walk on. The street is clear—no sign of Tom or Anna—and the part of me that can't resist a bit of drama is actually quite disappointed.

EVENING

Scott's just called to say he has to work late, which is not the news I wanted to hear. I'm feeling edgy, have been all day. Can't keep still. I need him to come home and calm me down, and now it's going to be hours before he gets here and my brain is going to keep racing round and round and round and I know I've got a sleepless night coming.

I can't just sit here, watching the trains, I'm too jittery, my heartbeat feels like a flutter in my chest, like a bird trying to get out of a cage. I slip my flip-flops on and go downstairs, out of the front door and on to Blenheim Road. It's around seven thirty—a few stragglers on their way home from work. There's no one else around, though you can hear the cries of kids playing in their back gardens, taking advantage of the last of the summer sunshine before they get called in for dinner.

I walk down the road, towards the station. I stop for a moment outside number twenty-three and think about ringing the doorbell. What would I say? Ran out of sugar? Just fancied a chat? Their blinds are half open, but I can't see anyone inside.

I carry on towards the corner and, without really thinking about it, I continue down into the underpass. I'm about halfway through when the train runs overhead, and it's glorious: it's like an earthquake, you can feel it right in the centre of your body, stirring up the blood. I look down and notice that there's something on the floor, a hair band, purple, stretched, well used. Dropped by a runner, probably, but something about it gives me the creeps and I want to get out of there quickly, back into the sunshine.

On the way back down the road, he passes me in his car, our eyes meet for just a second and he smiles at me.

RACHEL

•   •   •

FRIDAY, JULY 12, 2013

MORNING

I am exhausted, my head thick with sleep. When I drink, I hardly sleep at all. I pass out cold for an hour or two, then I wake, sick with fear, sick with myself. If I have a day when I don't drink, that night I fall into the heaviest of slumbers, a deep unconsciousness, and in the morning I cannot wake properly, I cannot shake sleep, it stays with me for hours, sometimes all day long.

There is just a handful of people in my carriage today, none in my immediate vicinity. There is no one watching me, so I lean my head against the window and close my eyes.

The screech of the train's brakes wakes me. We're at the signal. At this time of morning, at this time of year, the sun shines directly onto the back of the trackside houses, flooding them with light. I can almost feel it, the warmth of that morning sunshine on my face and arms as I sit at the breakfast table, Tom opposite me, my bare feet resting on top of his because they're always so much warmer than mine, my eyes cast down at the newspaper. I can feel him smiling at me, the blush spreading from my chest to my neck, the way it always did when he looked at me a certain way.

Excerpted from The Girl on the Train by Paula Hawkins. Copyright © 1905 by Paula Hawkins. Excerpted by permission of Riverhead Books. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.