A devoted couple with an adorable baby; Merry, Sam, and Conor are a happy family in an idyllic Swiss landscape. Into their perfect life comes Frank, Merry's childhood friend. From their tranquil home life to the majestic forest and Sam's new career as a filmmaker, everything seems primed to welcome her. Frank and Merry have always been more like sisters than best friends, so that's why Frank sees the things other people might miss. She sees horrible things that are just about impossible to believe about this perfect family. But Frank knows that the truth is hardly ever what you want the world to see. She'll soon break through the facade to uncover secrets darker than anyone could have imagined.