The special screening took place on Tuesday, April 21, three days before its commercial release in cinemas across Spain, scheduled for April 24. The event was attended by the film's team, led by director Manuel Sanabria and actress Aitziber Luma, as well as the mayor of Vitoria-Gasteiz and the general deputy of Álava.

Access to this special preview was arranged through double tickets raffled among readers of El Correo Álava, with invitations quickly selling out. The film stars Alejo Sauras as the former inspector and criminal profiler Unai López de Ayala, and Maggie Civantos as Esti. The cast is completed by Natalia Rodríguez, Natalia Millán, Aitziber Luma, Martín Urrutia, Ana Gracia, and Fernando Soto.

The film was directed by Manuel Sanabria and Joaquín Llamas, based on a screenplay by Rocío Martínez and Juan Carlos Cueto. The movie was produced by Isla Audiovisual in collaboration with Zebra Producciones (iZen Group), with the participation of RTVE, and will be released in cinemas on April 24 by distributor Vértice 360. Filming took place over nine weeks in late 2025 between Vitoria-Gasteiz and Madrid, featuring recognizable locations such as the Sancho el Sabio Foundation and the Plaza de la Virgen Blanca.

Set across a dual timeline between Vitoria-Gasteiz and the Madrid of bibliophiles, the film follows Kraken when an anonymous call forces him out of retirement: he has one week to find the legendary Black Book of Hours, one of the world's seven most coveted bibliographic treasures. If he fails, his mother, whom he believed dead for decades, will die.

The Black Book of Hours is part of the crime novel saga starring Kraken, whose first three titles form the White City Trilogy. The first of these, The Silence of the White City, was already adapted into a film in 2019. The saga, translated into more than 20 languages, has over 100 editions and boasts a reading community, the self-proclaimed 'Krakenians,' which now numbers over 4 million followers worldwide.