Mortal Remains is a "shockumentary" which aims to unearth the details surrounding the life, career and mysterious death of horror filmmaker Karl Atticus, referred to by some as a "pioneer of slasher films". The film features interviews with various horror aficionados and industry personalities including Eduardo Sanchez, director of the Blair Witch Project who wondered in a 2008 interview: Why for over 40 years has Atticus''s legacy been all but eradicated from the annals of horror film history? This film reveals much about this elusive figure: a man who inspired generation of filmmakers, but who has yet to receive due credit for his contributions to the genre. Crew members who worked alongside Atticus detail the puzzling circumstances under which his last film was created: missing cast members, intimations of occult activity and allegations of special effects "too convincing" for their time. Was Atticus a genuine auteur who challenged the industry and was silenced by his contemporaries