Fourteen members of the National Time Standards Agency use recently developed and (well, almost) perfected technology to travel back in time to Dallas in 1963 to videotape the assassination of John F. Kennedy and prove once and for all who shot the President. Only thirteen members return to the present time. The team makes a dangerous return visit to 1963 to recover the missing crew member. They discover the issue of who shot the president to be a lot more complicated than they imagined, causing them to have to make a dangerous compound trip to the past to collect additional proof of a conspiracy. The team ends up being pursued by operatives from another government agency that does not wish them to succeed and who will stop at nothing to prevent the team from the National Time Standards Agency from making what they learn public.