"Realidad: Novela en cinco Jornadas" by Benito Pérez Galdós is a novel written and published in 1889. Set in bourgeois Madrid, this work presents a marriage triangle involving Tomás Orozco, his wife Augusta Cisneros, and the shadow of her adultery with Federico Viera. Structured as a novel in five acts with theatrical dialogue, it serves as a companion to "La incógnita," presenting the same story from a different narrative perspective. The novel may contain autobiographical elements from Galdós's own romantic entanglements with a prominent Spanish countess.
Wikipedia page about this book: es.wikipedia.org/wiki/Realidad_(novela))