In 1957 Barcelona, Daniel Semper and his close friend Fermin Romero de Torres find their lives violently disrupted by the arrival of a mysterious stranger who threatens to divulge a terrible secret that has been buried for two decades in the city's dark past.

In an abandoned mansion at the heart of Barcelona, a young man, David Martin, makes his living by writing sensationalist novels under a pseudonym. Close to despair, he receives a letter from a reclusive French editor, Andreas Corelli, who makes him the offer of a lifetime--write a book unlike anything that has ever existed--a book with the power to change hearts and minds. In return, he will receive a fortune, and perhaps more. But as David begins...

Max and Alicia Carver, seeking refuge from war, move with their family from the city to a rural coastal town where they become caught up in an adventure involving sunken ships, the ghost of a drowned boy, and the mysterious Prince of Fog.

Irene and Ismael, spending a summer in Blue Bay, get caught up in a mystery involving ghosts, a mysterious toymaker, and a forest creature.