After the death of their patriarch, Stella Mortland and her three charismatic daughters, Julia, Finn, and Maisie, move into a medieval abbey at the beginning of the summer of 1967. Stella, still grieving for her late husband, hires a starving artist by the name of Lucas Feld to paint a portrait of her three daughters. What transpires is an idyllic summer where the sisters, their childhood friend Daniel Nunn and his pre-med friend Nick Marlow, and Lucas embark on passionate summer entanglements rife with many affairs of the heart. Julia is considering running away to London, Finn is entangled in trysts with all three boys, and 13-year-old Maisie is haunted by her imaginings of her father and the nuns who no longer live in the alley. The result is a painting that beautifully captures the mystery, romance, and heartbreak of the sisters while the summer ends in devastating tragedy. Fast forward to 1991 where Lucas has become a famous artist whose breakthrough painting, “TheSisters Mortland,” is soon to show at a retrospective exhibit, but Daniel, not middle-aged and fully embroiled in all the mid-life crises it entails, is still obsessed with the events of that fateful summer.