No.1 Sunday Times bestselling author and international sensation Clare Mackintosh puts a thrilling, modern spin on the classic locked-room thriller

THE EMOTIONAL, JAW-DROPPING SUNDAY TIMES BESTSELLING THRILLER.

AND DON'T MISS CLARE'S NEW BOOK A GAME OF LIES - OUT NOW.

'Hypnotically good' LEE CHILD
'Jaw-dropping twists' LUCY FOLEY
'The book of the summer' SUN

It's twenty hours to landing. A lot can happen in twenty hours . . .

You're on board the first non-stop flight from London to Sydney. It's a landmark journey, and the world is watching.

Shortly after take-off, you receive a chilling anonymous note.

There are people on this plane intent on bringing it down - and you're the key to their plan.

You'd never help them, even if your life depended on it.

But they have your daughter . . . So now you have to choose.

DO YOU SAVE HUNDREDS OF LIVES? OR THE ONE THAT MATTERS MOST?

'Feels like a blockbuster movie' LISA JEWELL

'The queen of nail-biting suspense' IRISH INDEPENDENT

'A nail-biter of a thriller' SHARI LAPENA

'A rip-roaring finale' GUARDIAN

'Propulsive - will have you questioning "what would you do?" at every turn' KARIN SLAUGHTER

'Mackintosh is a pro' NEW YORK TIMES

'Taking the locked room mystery to a new, white-knuckle extreme, this is electrifying' HEAT

'When Clare Mackintosh goes high concept, she doesn't mess around' LINWOOD BARCLAY

'An incredibly tense read that has a satisfyingly clever ending' GOOD HOUSEKEEPING

'A thrilling rollercoaster of a story. It'll leave you breathless' JANE FALLON

'A smart pay-off' THE TIMES, THE BEST THRILLERS FOR JUNE

'A tense, convincing, nail-biter of a thriller' ADELE PARKS, PLATINUM MAGAZINE

'A banger of a book with a truly agonising "what would you do?"' RUTH WARE

'A thrilling, chilling gut-punch of a book' RED

'Why did no one warn me how bloody addictive it is?' TAMMY COHEN

'I dare anyone to read this high-octane, tense thriller on a flight' PRIMA

'I got wrong-footed, then I got whiplash! Mind-blowing' SANDIE JONES

'The year's most intriguing high-concept plot' DAILY EXPRESS

'Full of mystery, tension and emotion. An incredible thriller' ALLIE REYNOLDS

'Buckle up for some edge-of-your-plane-seat action' FABULOUS