Assumption is a virtuosic personal tribute, a glimpse at history and a celebration of independent film culture. Gidal's short film was assembled round a recording of the voice of Mary Pat Leece, who worked at the London Filmmakers' Co-op in the mid-1970s, and later became a much loved lecturer at St Martins School of Art. She died suddenly in 1997. The film's rapid-fire montage of images and sounds encapsulates her politics, her Catholicism and her intellectual passion.