Welcome to Provence, where the Lady of the Chateau, Séraphine Demargelasse, has opened its elegant doors to her granddaughter Darcy and three friends. Twenty years earlier, the four girlfriends studied abroad together in France and visited the old woman on the weekends, creating the group's deep bond. Amid winery tours, market visits, and fancy dinners, it becomes clear that each woman has a hidden reason for accepting the invitation. When Séraphine is found brutally murdered and sinister Instagram account pops up, it exposes snapshots from the friends' intimate moments. The chateau and its inhabitants have many secrets--several worth killing for.