Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: Who are professional skeptics? Movie plot title: Red Lights Movie plot: The film opens with two primary characters: university academic Margaret Matheson (Sigourney Weaver), who investigates claims of paranormal phenomena, and her assistant Tom Buckley (Cillian Murphy), a physicist. The audience is provided with an insight into the world of the opening section's primary characters while concurrently observing the public re-emergence of a psychic, Simon Silver (Robert De Niro). The ending of the film's first half is signified by the sudden death of Matheson from a chronic vascular condition at the same time that one of Silver's comeback performances takes place; an incident that is particularly significant due to the death of a former nemesis of Silver, a skeptic who investigated the psychic's work, under similar circumstances. Matheson also had a previous encounter with Silver. She recounted a public meeting when Silver had, for an instant, got the best of her by bringing up the subject of her son's spirit (her son was in a vegetative coma and on life support). Matheson agrees only to appear on a televised panel in anticipation of Silver's return. Prior to her death, Matheson refuses to co-operate with Buckley's insistent call to undertake another investigation of Silver, warning Buckley against such an undertaking due to her previous experience with the psychic. However, following Matheson's death, the assistant becomes increasingly obsessed with investigating Silver for the purpose of exposing the popular psychic as a fraud. During Buckley's efforts to reveal Silver's large-scale trickery, a series of inexplicable events occurs electronic devices explode, dead birds appear, and Buckley's laboratory is vandalised. Buckley's paranoia intensifies, as he believes Silver is behind these incidents. Buckley's calm and rational disposition eventually degenerates into an obsessiveness that resembles the late Matheson's intense antipathy to paranormal claims. As part of the introduction to the climactic section of the film, Silver agrees to participate in an investigation proposed by...
The answer to this question is:
Margaret Matheson and Tom Buckley