In an abandoned mansion at the heart of Barcelona, a young man - David Martin - makes his living by writing sensationalist novels under a pseudonym. The survivor of a troubled childhood, he has taken refuge in the world of books, and spends his nights spinning baroque tales about the city's underworld. But perhaps his dark imaginings are not as strange as they seem, for in a locked room deep within the house letters hinting at the mysterious death of the previous owner. Like a slow poison, the history of the place seeps into his bones as he struggles with an impossible love. Then David receives the offer of a lifetime: he is to write a book with the power to change hearts and minds. In return, he will receive a fortune, perhaps more. But as David begins the work, he realises that there is a connection between this haunting book and the shadows that surround his home... 
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