Chapter Summary

The novel is built from very short, titled chapters, but it moves through a handful of clear phases: a framing memory, one catastrophic day, and then the library itself, where Nora tries on the lives she might have lived. The walkthrough below follows that real sequence. (Haig groups the chapters more by scene than by numbered "Parts," so the headings here track the book's narrative movements rather than inventing formal part titles.)

Nineteen Years Before She Decided to Die

The book opens with a memory. A teenage Nora Seed sits in her school library playing chess with the librarian, Mrs Elm, when the phone rings with the news that Nora's father has died. Mrs Elm is kind and unhurried; she tells Nora that she doesn't have to understand life, only live it, and that a game — like a life — is played one move at a time. The scene plants everything the novel will grow: the library as a place of refuge, chess as a metaphor for choice, and Mrs Elm as the voice of consolation Nora will summon when she has nowhere else to go.

The Last Day

Cut to the present. Nora is in her mid-thirties, living alone in Bedford, and her life is quietly collapsing. In the space of a single day she is let go from her job at the music shop String Theory; she learns that her cat, Volts, has been found dead by the roadside; the boy she gives piano lessons to no longer wants them; her elderly neighbour Mr Banerjee doesn't need her; and her estranged brother Joe won't return her messages. She is haunted by everything she gave up — competitive swimming, her band, an old plan to study glaciers, her wedding to Dan — and by the sense that no one would notice if she were gone. That night she writes a note and takes an overdose. As she loses consciousness, time stops: the clock freezes at exactly 00:00:00.

Midnight: The Library Between Life and Death

Nora wakes in an impossible building — endless shelves under a green-tinged light, where it is always midnight. Mrs Elm is there again, now the librarian of this place. She explains the rules. Between life and death sits this library, and every book on its infinite shelves is a version of the life Nora could have lived had she chosen differently. One vast, heavy volume is The Book of Regrets; when Nora opens it, the weight of every abandoned choice nearly crushes her. But the regrets can be tested: pick a book, and Nora will drop into that alternate life as the self who lived it. If the life disappoints her, she feels a pull back to the library. If she ever finds a life she truly wants — one where she stops feeling like a stranger — she can stay, and the library will disappear. Her original, dying existence is her "root life."

The First Lives: Testing the Regrets

The pub with Dan

Nora's first stop undoes the regret that has nagged longest: calling off her wedding. She lands in the life where she married Dan and ran a country pub. It is a disappointment — the pub is struggling, Dan drinks and resents her, and the marriage has curdled. Leaving him, she realises, was not the mistake she had spent years believing it to be.

The swimming life

She tries the life where she never quit swimming and became a celebrated Olympic-level athlete. She is rich, fit, and admired, but the success feels hollow and bought at a cost. As with the pub, the fantasy looks better from the outside than from within.

Australia and Izzy

Nora enters the life in which she followed her best friend Izzy to Australia — only to discover that in this version Izzy has died. The lesson is brutal and central: a different choice guarantees nothing, and Nora's happiness is not the only thing at stake in any given road.

Deeper Lives

The Labyrinths and stardom

Nora slips into the life where she stayed with her band, The Labyrinths, and became a famous musician touring the world. It is the dream she thinks she wanted — until she learns that in this timeline her brother Joe is dead of an overdose. Her stardom and his death are tangled together. She flees the life in grief.

Glaciers, Svalbard, and the polar bear

She lives out the old ambition to study glaciers, waking as a researcher on the Arctic archipelago of Svalbard. The work is meaningful and the landscape sublime; a terrifying, awe-struck encounter with a polar bear makes her feel intensely, frighteningly alive — the first hint that what she has been missing is not a particular life but the sensation of living one.

Hugo and the sliders

In one of these lives Nora meets Hugo Lefèvre, a Frenchman who, like her, is sliding between his own possible lives (his in-between place is a video store rather than a library). Hugo is content to drift forever, sampling lives without committing to any. He is a warning as much as a companion: a person who never chooses is not free but stuck.

The Near-Perfect Life

As Nora grows more skilled, she begins to slide faster, sampling dozens of lives. Then she finds one that seems to fit: a warm, successful existence as a philosophy lecturer in Cambridge, married to a kind man named Ash, mother to a small daughter, Molly. For the first time she wants to stay. But because she is not the Nora who actually built this life, she begins to fade from it — she can't hold a life she hasn't lived. The near-perfect life slips away, and with it the illusion that any single book could be the answer.

The Library Collapses

Back in the library, everything starts to fall apart. Shelves buckle, books ignite, the whole structure shudders — because Nora's root-life body is dying, and the overdose is finishing its work. Mrs Elm, frantic, urges her to choose. Nora finally understands what all the lives have been teaching her: there is no perfect alternative waiting to be claimed, every life carries its own sorrows, and the thing she truly wants is not a different life but to be alive. In the crumbling library she seizes the Book of Regrets and writes that she wants to live; the pages empty.

The Return and Epilogue

Nora wills herself back into her root life and wakes — she has survived. In the aftermath she begins, tentatively, to build the life she nearly ended: she reconnects with people, resolves to teach piano again and to actually reach out to her brother, and looks at her ordinary existence with new attention. In a closing echo of the opening, she visits a care home and finds the real, now-elderly Mrs Elm, and the two sit down to play chess — the game beginning again, one move at a time.