Apparently this film is based on real events as it's illustrated in the opening text of the film. The plot synopsis made it sound a lot more thrilling, suspenseful and disturbing then how it eventually became. It turned out to be a depressing drama.
The incident of the kidnapping and the actual act between the siblings occurred quite early (around 20 - 25 mins) which looked and felt relatively realistic. We are later noted that it was apart of a certain adult film series of sorts. The scene is quite lengthy as nudity of both actors are shown. It isn't too graphic. It's the actual thought of the act which is the disturbing part. Aside from this, there isn't any other tense scene (save for a bizarre and random rape scene towards the end (1:06:40)- which felt entirely out of place).
The acting by the lead of Daniel was rather weak as we could tell he didn't have much experience (apparently this was his very first role). The character seemed like the typical shy quiet teenager at first barely speaking then as the film progressed he seemed more like a psycho. The acting by the actress of Ana was a lot better.
After the incident occurred there was over an hour left of film and the remaining time was simply both characters moping around looking sad, depressed and traumatized by the incident. Although the incident was traumatic we wonder why neither of them told their parents, or Ana not telling her fiancé. She only tells a therapist but even so she didn't give her real name.
The film just has a depressing and dull feel. The two siblings act like it was the end of the world. If anything they were extremely lucky the kidnappers didn't kill them. They seemed to give them back their items (phones/wallets) and did no physical harm. Was expecting something entirely worse but they were ultimately left untouched. Perhaps the motives of the brother Daniel was due to jealousy of his sisters fiancé. The rape scene felt out of place and they didn't exactly discuss it later. Perhaps we are led to believe he had feelings for her which is why he did that? Overall this film feels like they could have done more and went a little more extreme. It ultimately felt tame.