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.

Watching over them is the resort's director, a woman on a mission to reinvigorate their tired bodies and minds.

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

With her wit, compassion and uncanny understanding of human behaviour, Liane Moriarty explores the depth of connection that can be formed when people are thrown together in... unconventional circumstances.