According to the search results, the movie "Reptile" is a murder mystery that keeps the audience on the edge of their seat. The movie revolves around the murder of a young real estate agent named Summer, and the investigation that follows. In the final act of the movie, it is revealed that Summer was murdered as part of a cover-up to prevent her from talking to the FBI about a criminal conspiracy. The killer was revealed to be Will, Summers boyfriend, who was involved in the conspiracy along with some of his closest colleagues. The director of the movie, Grant Singer, intentionally left some questions unanswered and wanted to leave the ending open-ended for the viewers to come to their own conclusion. Therefore, the movie does not have a definitive ending, and the audience is left to interpret the events that unfold in their own way.