At 8:17 one ordinary morning, every clock in the world stopped.

Nothing else did. Bread finished baking. Rain went on falling. A child kept drawing a horse and got the back legs wrong. In a hospital, one heart went on beating and another stopped, and a hand was held for as long as it took.

By that afternoon, people everywhere had made the same discovery: nothing had been taken from them. Life was exactly where they left it. Only the counting was gone — and the counting, it turned out, was the thing they had been living inside.

THE DAY THE CLOCK STOPPED opens with that thought experiment and spends fifty chapters on the question underneath it.

Have we become better at measuring life than at living it?

You know how old you are. Do you know where you have been?

Most of us can say exactly how many years we have lived and remember almost none of them. We can name the hour, the deadline, the age we were meant to have arrived by — and cannot account for last Tuesday. This book is about the difference, and about what it costs.

Somewhere in the last decade you lost a year. Possibly several. Not to anything shameful — to work that had to be done, to people who needed you, to a stretch that had to be got through. Those years were spent on the right things and they are gone anyway, and nobody has explained why.

Across ten Parts, it takes the whole subject apart:

— Why the clock was invented, and how "on time" became a verdict on your character

— Why the past has no address, and why regret is a negotiation with something that cannot answer

— Why tomorrow has never once happened, and why we live there anyway

— Why you are not behind — and why "behind" requires a shared route that does not exist

— Why childhood summers lasted forever, and what actually makes a year survive in memory

— What a moment is, and why nobody has ever managed to hold one

— Why love collapses an hour and grief refuses the calendar entirely

— Why the last ordinary day of a life is never recognised

— What is left of time when thought goes quiet for two seconds

— And how to make an ordinary day larger, using five practices that fit a life you cannot change

This is not a productivity book. It will not help you fit more into a week, and it does not ask you to quit your job, sell your house or wake at five. It assumes you have obligations you did not choose, and argues that the change worth making does not require any of them to alter.

Nor is it a book that overclaims. Where the science is unsettled, it says so. Where a contemplative idea cannot be proved, it is offered as something to test rather than something to believe.

What it offers instead is precision — and a few seconds, occasionally, in which you notice you are counting rather than living, and stop.

Every chapter ends with something to test rather than something to agree with. Guess the time before you check it, and watch the size of the urge. Write down the three things you feel behind on, then the age you were meant to have done them by, then where that number came from. Run one ordinary day without measuring it, and find out how long a day actually is.

It is for the person who has everything they were supposed to want and cannot find the afternoons. For the one lying awake at three doing arithmetic. For anyone who has looked at a photograph of themselves at seven and been unable to say what in it still exists.

Written for readers on every continent, THE DAY THE CLOCK STOPPED is for anyone who has looked up from an ordinary week and wondered where eleven years went.

Read it slowly. There was never any hurry.