Sara, Lucía, Sofía and Claudia are sisters, 4 modern women with very different personalities, who come together at their mother's funeral, after which they discover the man they've all called "dad" throughout their lives is not really their father. They embark on a quest to discover who their real fathers are, discovering more about themselves, their mother, and their lives.

Madrid, Spain, 1975; shortly after the end of the Franco dictatorship. Six months after the mysterious death of his lover, a prestigious tailor, a married woman visits the office of the young Germán Areta, a former police officer turned private detective, to request his professional services.

A group of four amateur adventurers who specialize in exploring remote and forsaken places pay a visit to Shookum Hills, a town in the remote Appalachian Mountains which was abandoned decades ago due to a mysterious coal mine fire.

Supernatural intuition and police logic collide when a mysterious clairvoyant and a skeptical detective have to join forces in order to unravel the case of a serial killer lurking in the woods surrounding a small town.