In 1957, a few years after Henri Cartier-Bresson photographed the San Fermín festival in Pamplona, Ramón Masats arrived at the celebration with a Leica and a Pentax and captured that unique universe with a gaze committed to severe and forceful composition: a historic work that was a milestone in Spanish photography. Half a century later, the author meets another great photographer and picture editor, Chema Conesa, to dive into those archives, rescue unpublished images and recompose a narrative that, like all great stories, has outlasted time. The unpublished images in this edition were personally selected by Masats, accompanied by the professionalism of Conesa, and their sequential order reflects the imprint of the photographer, also a maker of television documentaries. The book is completed by a text published in 1927 by Ernest Hemingway. Bulls, white and red combined with noise, music, folklore and crowds: the same that Masats lived during the months of July 1957 and 1960 when he was collecting snapshots.