FROM THE WORLDWIDE #1 BESTSELLING AUTHOR BEHIND EMMY- AND GOLDEN GLOBE-WINNING HBO SERIES BIG LITTLE LIES AND SMASH-HIT NOVEL THE HUSBAND'S SECRET

The retreat at health-and-wellness resort Tranquillum House promises total transformation.

Nine stressed city dwellers are keen to drop their literal and mental baggage, and absorb the meditative ambience while enjoying their hot stone massages.

Miles from anywhere, without cars or phones, they have no way to reach the outside world. Just time to think about themselves, and get to know each other.

Watching over them is the resort's director, a woman on a mission. But quite a different one from any the guests might have imagined.

For behind the retreat's glamorous facade lies a dark agenda.

These nine perfect strangers have no idea what's about to hit them . . .

'This wonderful novel by the Big Little Lies author had me utterly hooked' Daily Mail

'Acutely observed, pacey' Sunday Times

'Original, suspenseful and laugh-out-loud funny. Downright brilliant' Clare Mackintosh

'Utter brilliance, with a twist halfway through that blew my mind' Marian Keyes

'I am jealous of anyone who hasn't read this yet' Grazia

'If it was summer, this would be your beach read. As it is, settle under a duvet and begin . . .' Stylist

'Hugely enjoyable. Will grip you from the first page. Brilliantly combines humour with emotional honesty' Sunday Express

'A super-suspenseful page-turner' Mail on Sunday

'Another page-turning belter. An absolute must' Heat

Summary Could ten days at a health resort really change you forever? These nine perfect strangers are about to find out.