Spain, Basque Country, 17th century. At night and through the mountains, Kattalin escapes from her farmhouse and, while wandering through the deep forest, she senses a presence that stalks her.

This documentary recounts the story of the ETA militant Lucía Urigoitia, who died in 1987 in Pasaia at the hands of the Civil Guard, in circumstances which remain unclear. Based on the account given by the Urigoitia family's lawyer and the forensic scientist involved in the case, the narrative pores over the contradictions and doubts surrounding the process. The tree stands out in the documentary as a symbol of the need for a complete memory, as opposed to the idea of one single memory.