What happened at Morriton Manor?

Name: What happened at Morriton Manor?
Director: Hauke Gerdes
Genre: Mystery
Released: 2017-02-24T00:00:00.000Z
Duration: 240 min
Rating: 9
Cast: Hauke Gerdes, Etienne Gardé, Daniel Budiman, Nils Bomhoff, Simon Krätschmer

The puzzle goes off well: what happened on Morriton Manor?