Hours before her assassination, indigenous leader Berta Cáceres wrote down the names of the corrupt interests aiming to kill her. Using these clues, the documentary puts together the puzzle pieces to help Berta solve her own murder. In the most dangerous country in the world for environmental defenders, Milton Benítez, a tenacious Honduran journalist, follows the clues written down with Berta in the meeting they held the day before her murder. With the help of Almudena Bernabeu, a renowned international lawyer, the puzzle is put together... What killed Berta? Behind the crime, the questioned operation of companies in collusion with public officials, forges a pattern of death.