In Cold War England, Professor Henry Lytten, having renounced a career in espionage, is writing a fantasy novel that dares to imagine a world less fraught than his own. He finds an unlikely confidante in Rosie, an inquisitive young neighbor who stumbles through a doorway in his cellar and into a stunning and unfamiliar bucolic landscape. There she meets a young boy named Jay, who is about to embark on a journey that will change both their lives. Elsewhere, in a distopian society where progress is controlled by a corrupt ruling elite, the brilliant scientist Angela Meerson has discovered the potential of a powerful new machine. When the authorities come knocking, she will make an important decision --- one that will reverberate through all these different lives and worlds.

An internationally renowned writer, Valeria Costas has dedicated her life to her work and to her secret lover, Martìn Acla, a prominent businessman. When his sudden stroke makes headlines, her world implodes; the idea of losing him is terrifying. Desperate to find a way to be present during her lover's final days, Valeria commissions his artist wife, Isla, to paint her portrait. In the grand, chaotic London mansion where the man they share --- husband, father, lover --- lies in a coma, Valeria and Isla remain poised on the brink, transfixed by one another. Amidst their own private turmoil, the stories of their lives are exchanged, and as the portrait takes shape, we watch these complex and extraordinary women struggle while the love of their lives departs,