A portrait of a sad and infamous episode in the history of Spain: the Basque witch trials in the 17th century.

The gloomy dungeon of the Santo Oficio gaol in Logroño, northern Spain, is packed with prisoners accused of witchcraft. The sound of mystical chanting drifts out through the bars. It is a desperate cry for help that travels through valleys and mountains until it reaches the hamlet of Zugarramurdi. A young boy wakes up suddenly in the middle of the night...