When two contestants in an exclusive womens marathon are kidnapped, Kris and Kelly must run the marathon to try and discover who is behind the kidnapping.

When Kris and Kelly try and register in place of the two missing girls, they discover that replacements have already been made by the craft sisters, Mary and Joanne.

They discover that there is a plot to kidnap a wealthy Arabians daughter who is also running in the race and that is the real motive for the kidnappings.  The Craft sisters, who are working with the kidnappers left their registration for the race too late so all the spots were taken.  The only way to get into the race was to kidnap two of the other runners and take their places.  The plot is eventually uncovered and the hostages are rescued.