Moore stars as Michaela Kell, an ambitious lawyer turned socialite who hires 25-year-old Simone DeWitt (Alcock) as a live-in personal assistant on the island estate she shares with Peter (Kevin Bacon), her husband of 13 years. Fahy plays Simone’s older sister, Devon, who still lives in their hometown of Buffalo and tends to their father, Bruce (Bill Camp), who has early-onset dementia. Eventually, Devon shows up at the Kells’ property looking for Simone.