What happend to lisa in "wicker park"?!

I basically know the wholee story about how he falls in love with her and then she disappears when he asks her to move in, and how the girl next door is obsessive!.!. But where does lisa vanish to!? and what does the girl next door have to do with it!? and how do lisa and the guy get back or whatever!? HELP PLEASE this movie looks really good! too bad ive only seen bits and piecess
Www@Enter-QA@Com

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