THE EMOTIONAL, JAW-DROPPING SUNDAY TIMES BESTSELLING THRILLER.

AND DON''T MISS CLARE''S NEW BOOK OTHER PEOPLE''S HOUSES - 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