There are some cases when historical events are wrongly denoted and become significantly consolidated by the number of people that believe in them. This is specially important to this work, as still nowadays it is considered that the book “Lisboa Cidade Triste e Alegre” (in english: “Lisbon happy and sad city”) (1959) by Victor Palla and Costa Martins has an aura of an anti regime discourse. This idea, even tough if it is not represented by means of facts or sources, is generalized when talking about the book, allowing a close relationship with the concept of post-truth when an idea is understood as consolidated only by its status and not by its evidence. The present work tries to understand the reason beneath the consolidation of this idea, as well as to understand what does the book means, through its photograph, representing the universe of Palla and Martins and the elements that influenced them and the book, such as the political context of the era, the historical conjuncture and battle of forces. Regarding photography, an analysis is performed to understand the style of the authors and the occult significances in order to perceive the exact type of discoursing the book contains.