Twins Natasha and Max Kitson have lived their lives on the road, together building Max's career as a world-renowned pianist. But when, at age 20, the former prodigy begins making uncharacteristic mistakes, he abruptly cancels his remaining concerts and moves himself and his sister into the home of an enigmatic French patron, never realizing that Henri has been his sister's lover. In Paris, over the course of one summer, Natasha's long-simmering resentments and Max's deep insecurities drive the siblings apart as each vie for Henri's attentions. But neither twin can have their host entirely to themselves. While Henri woos Natasha with lavish gifts and trips to the ballet during the day, it's Max's music that draws Henri from bed each night.

In the summer of 1973, Ruth and her four friends were obsessed with pre-Raphaelite paintings. Drawn to the cold depths of the river by Ruth’s house, the girls pretend to be the drowning Ophelia, with increasingly elaborate tableaus. But by the end of that fateful summer, real tragedy finds them along the banks. Twenty-four years later, Ruth returns to the suffocating, once grand house she grew up in, the mother of young twins and 17-year-old Maeve. Joining the family in the country is Stuart, Ruth’s childhood friend, who is quietly insinuating himself into their lives and gives Maeve the attention she longs for. She is recently in remission, unsure of her place in the world now that she is cancer-free. Her parents just want her to be an ordinary teenage girl. But what teenage girl is ordinary?

In August 1939, 30-year-old Hetty Cartwright arrives at Lockwood Manor to oversee a natural history museum collection, the contents of which have been taken out of London for safekeeping. She is unprepared for the beautiful and haunted Lucy Lockwood. For Lucy, who has spent much of her life cloistered at Lockwood suffering from bad nerves, the arrival of the museum brings with it new freedoms. But it also resurfaces memories of her late mother, and nightmares in which Lucy roams Lockwood hunting for something she has lost. When the animals appear to move of their own accord, and exhibits go missing, they begin to wonder what exactly it is that they might need protection from.