Caplin never existed, he was a front for a mysterious group's law
enforcement dealings, could be CIA, FBI, who knows... The blonde
love interest, Eve Kendall (Eva Marie Saint), is a secret agent
the CIA, FBI or whoever) and
she seems to have gotten herself into a spot of bother...
(Cary Grant) has fallen for Eve and tries to help her out when he
discovers her predicament. She is working undercover with a group
led by Phillip Vandamm (James Mason) - they have just realized that
she is not to be trusted and are about to kill her.
an attempt to protect her cover, Kendall supposedly kills Thornton
but she only fires blanks at him. Thankfully, this is the only gun
the baddies have so whenever they hold anyone up it's possible to
just walk away - he he he. Our heroes eventually escape by climbing
over that South Dakota mountain with the president's faces carved
last we see of our love birds is that they are about to start boinking
on the train again... but don't worry 1950's folk - he calls her
Mrs Thornton!!! Que train going into tunnel - oohh ahhh missus...