Nine Perfect Strangers by Liane Moriarty

Nine people gather at a remote health resort. Amidst all of the luxury and pampering, they know these ten days might involve some real work. But none of them could imagine just how challenging the next ten days are going to be.

Frances Welty, the formerly best-selling romantic novelist, arrives at Tranquillum House nursing a bad back, a broken heart, and an exquisitely painful paper cut. She’s immediately intrigued by her fellow guests. Most of them don’t look to be in need of a health resort at all. But the person that intrigues her most is the strange and charismatic owner/director. Could this person really have the answers Frances didn’t even know she was seeking? Should Frances put aside her doubts and immerse herself in everything Tranquillum House has to offer – or should she run while she still can?