Víctor is a mathematician who is working on his thesis in a downtown café. Suddenly, something draw his attention. An atractive young woman has just started to deliver some flyers in front of his window. After a look game, Víctor begins to calculate, mathematically, the probabilities of success of the relationship, in case he´d decide to go out and talk to her.

The real, passionate, epistolary love affair between two of the most brilliant minds of 19th-century Spain: Emilia Pardo Bazán and Benito Pérez Galdós. A story of love, passion, and sex, ahead of its time.