Bart (Tye Sheridan) is a very introverted young man. In order to treat his autism and improve his social skills, Bart works as a night waiter in a hotel. His greatest interest is to observe the guests from the hotel's surveillance. One day, a woman was killed in the hotel, and Bart, the only one present, became the number one suspect. What scared Bart was that the murderer did not seem to stop, but committed murders one after another. In order to clear his suspicion, Bart decided to start looking for the murderer's traces. In the process, Bart and a female tenant named Andra (Anade Armas) collided with romantic sparks. Bart must step up his pace to find the real murderer, because otherwise, Andra may become the murderer's next target.