Sunday Times bestselling author and international sensation, Clare Mackintosh, brings her showstopping quality to this modern take on the classic locked-room thriller THE BBC RADIO 2 BOOK CLUB PICK AND INSTANT SUNDAY TIMES BESTSELLERYou can save hundreds of lives.Or the one that matters most . . . 'A NAIL-BITER OF A THRILLER' SHARI LAPENA 'HYPNOTICALLY GOOD' LEE CHILD 'FEELS LIKE A BLOCKBUSTER MOVIE' LISA JEWELL'THE BOOK OF THE SUMMER' SUNThe atmosphere on board the first non-stop flight from London to Sydney is electric. Celebrities are rumoured to be among the passengers in business class, and the world is watching the landmark journey. Flight attendant Mina is trying to focus on the passengers, instead of her troubled five-year-old daughter back at home - or the cataclysmic problems in her marriage. But soon after the plane takes off, Mina receives a chilling anonymous note. Someone wants to make sure the plane never reaches its destination. They're demanding her cooperation . . . and they know exactly how to get it. It's twenty hours to landing. A lot can happen in twenty hours . . .'The queen of nail-biting suspense' IRISH INDEPENDENT'Utterly riveting, with so many jaw-dropping twists and turns' LUCY FOLEY'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'A stunning twist' LITERARY REVIEW'Mackintosh has raised her game' PUBLISHERS WEEKLY STARRED REVIEW'Heart-stopping' CRIME FICTION MONTHLY