How many movies have Christian Riva and Giulio De Santi collaborated on?

They have worked on 4 movies together! Their first movie together was Adam Chaplin (2011) while their highest rated movie together was Hotel Inferno 3: The Castle of Screams (2020). They have not worked together since Hotel Inferno 3: The Castle of Screams (2020). They are most known for their horror films together.