Living on her family’s idyllic lakeside estate in Cornwall, England, Alice Edevane is a bright, inquisitive and precociously talented 16-year-old who loves to write stories. One midsummer’s eve, after a beautiful party drawing hundreds of guests to the estate has ended, the Edevanes discover that their youngest child, 11-month-old Theo, has vanished without a trace. He is never found, and the family is torn apart and the house abandoned.

World War II London: When Victoire “Paddy” Bennett first walks into the Admiralty’s Room 39, home to the Intelligence Division, all the bright and lively young woman expects is a secretarial position to the charismatic Commander Ian Fleming. But soon her job is so much more, and when Fleming proposes a daring plot to deceive the Germans about Allied invasion plans he requests the newlywed Paddy's help. She jumps at the chance to work as an agent in the field, even after the operation begins to affect her marriage. But could doing her duty for King and country come at too great a cost?

Meet the Tobin family. Joy - the mother: Unconscious in a hospital bed, Joy's latest act has thrown the family into turmoil. Frances - the middle child: Seemingly perfect wife and mother, Frances is having inappropriate dreams about an ex, and might be about to derail her whole life. Conor - the protector: Successful and famous, high-flyer Conor is walking a fine line between self-promotion and self-detonation. Sinead - the baby of the family: Bohemian rebel, trying to write the story she needs to tell, but despising herself for failing to do it.

Indulged and wealthy Kat Fitzhubert is sold in an arranged marriage to a colony across the world. Lady Viola Montefiore is the dark-skinned changeling of a ducal family, kept hidden and then shipped away. Titania Boot is as broad as a carthorse and as useful. On the long sea voyage from their homeland of England, these three women are fast bonded in an unlikely friendship.

London, 1991: Alex Johns, trainee art intern at the Courtauld, believes a hidden secret lies within Diego Velázquez's Las Meninas—one of the most written about paintings of all time. Her own mother died in mysterious circumstances while trying to uncover its secrets and Alex is troubled by memories of her own encounter as a child with the girl in the painting—the Infanta Margarita—who continues to haunt her. Alex must take up her mother's work and find evidence to uncover the truths within the canvas