Half the world is in darkness. Only she can save the light . . . the post-apocalyptic bestselling read.

'A brilliant near-future thriller and a really cracking read' Richard Osman
'Will keep you gripped to the very last page' C.J. Tudor
'Wonderful ... the best future-shock thriller for years.' Lee Child
'A stunningly original thriller' Harlan Coben
'A beautifully realised and thought-provoking thriller' The Times
'Intriguing and unusual' Sunday Times
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2059. The world has stopped turning.

One half suffers an endless frozen night; the other, nothing but burning sun.

Only in a slim twilit region between them can life survive.

In an isolationist Britain clinging on in the twilight zone, scientist Ellen Hopper receives a letter from a dying man. It contains a powerful and dangerous secret.

One that those in power will kill to conceal . . .
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'Reminiscent of Robert Harris's high-concept conspiracy thrillers' Financial Times
'I read this hungrily ... A fabulous achievement.' Stephen Fry
'Inventive, richly detailed world-building' Telegraph
'A tantalizing, suspenseful odyssey of frustration, deceit, treachery, torture, hope, despair and ingenious sleuthing' Washington Post
'A taut, thrilling runaround' Guardian
'A brilliant debut ... Fans of Robert Harris will love it' Daily Express
'To say it's gripping is an understatement' Sara Pascoe
'Murray has crafted something original ... an interesting new twist on a post-apocalyptic tale.' Kirkus
'Downright impossible to stop reading.' Booklist
'Dark, believable and brilliantly written' Jenny Colgan
'I couldn't put this book down!' Christina Dalcher