the last of the mohicans

ok, so sometime around 3:00 am i woke up and could not get back to sleep because of sinus congestion....and for some unexplainable reason i could not get the film version of the last of the mohicans out of my head......i could not quite recall the story line, and could not recall why the younger sister throws herself off of a cliff.....and so today i looked it up on wikipedia......the next tiem this movie keeps me awake i will have a better shot at recalling the particulars...