Mulder and Scully are called in to investigate the murder of a jet propulsion scientist who was trapped in a wind chamber and sucked through a jet engine when the unit was activated. It isn't the first death among the scientists there, with Arthur Grable having died in an accident several months before. As they gather evidence in the case the main suspect becomes the janitor, Roland, who is autistic but with a great knowledge of fluid mechanics. When Mulder finds a connection between Roland and the first dead scientist, it opens up any number of possibilities.