False Notes (2016)

Alex gets a surprise visit from his childhood friend Jóhann who hasn't been a part of his life since he became a famous music producer. Jóhann wants to make up for lost time and and after some convincing he drags Alex along with him to a cabin in the country which they went to as kids. Alex seems pleased to get his old friend back and is completely unaware that another car has been following them since they left town.