This film has you on the edge of your seat first from the tension and connection between the two main characters, then also when the story switches gears and you find out that Jennifer and Guy are very much not strangers to each others' lives. I felt the performance from the two was fantastic given the whole plot of the movie rested on their shoulders. Also, the movie kept the pressure building even after the duo left the confines of the elevator, which was the main location for the majority of the film and the premise of the whole story. Overall, loved the story, and especially satisfied with the ending. Would recommend to any horror fan who likes suspense.