"Nine Perfect Strangers" is a novel by Liane Moriarty that follows the lives of nine individuals who attend a wellness retreat at a secluded resort. Each character arrives with their own personal struggles and secrets, seeking healing and transformation. At the retreat, they encounter Masha, the enigmatic owner, who employs unconventional methods to help them confront their issues. As the story unfolds, the characters must navigate their relationships with one another and the challenges posed by Masha's intense program, leading to unexpected revelations and growth.