![The London Underground Killer](https://image.tmdb.org/t/p/w185/q279qishUKUHP5Y1NhbhVykJX6C.jpg)
In 2016, a young Austrian filmmaker began documenting amateur inventor Peter Madsen. One year in, Madsen brutally murdered Kim Wall aboard his homemade submarine. An unprecedented revelation of a killer and the journey his young helpers take as they reckon with their own complicity and prepare to testify.