In November 15, 2017, the painting Salvator Mundi, attributed to Italian artist Leonardo da Vinci (1452-1519), was sold for an unprecedented $450 million. An examination of the dirty secrets of the art world and the surprising story of how a work of art is capable of upsetting both personal and geopolitical interests.

1950, Moscú. Katya es una espía estadounidense en plena carrera armamentística de la Guerra Fría. Cuando le asignan su misión más importante, conseguir información secreta de la joven promesa del gobierno ruso, Alexander, lo último que espera es que va a enamorarse de él. Intentar conciliar su pasión hacia a él con su rechazo al comunismo la llevará a hacer el mayor de los sacrificios, un gesto que Alexander descubrirá treinta años más tarde.

A young woman who has just started a job at an art museum writes an email to a friend she lived with until recently. The other woman, also young, works as an artist and has just moved to a new city. A narrator reads this email, but we don't know which of the two women the voice belongs to, whether to the sender or to the receiver of the message. Neither are we aware of the details of this relationship; but what we do know is that, in addition to their interest in art, they share a concern for the difficulties of carrying out their personal and professional lives in the present. By focusing on the peripheral or hidden details of some paintings in the Bilbao Fine Arts Museum, this narrator relates several stories linked to the social, economic and psychological conditions of the artists, both past and present.

A journey through the Spain of the Baroque, the glorious 17th century, an unfortunate era of endless wars and political tribulations; but also of great painters and sculptors who created astonishing pieces of art: el Siglo de Oro.