Well... You should just watch the movie, but they messed it up. Long story short, bella swan falls in love with edward cullen(who is a vampire). Then this clan of vamps (victoria, james, and laurant) find out, and james wants to kill bella. He chases her down and gets her alone, but edwardo saves her, and kills james. Then when they r at prom, bella tells edward that she wants to be a vampire to. Then it shows victoria. Because james was victorias mate, and edward killed him. So then victoria wants to kill bella, then it ends. But the sequal comes: New moon, eclipse, and breaking dawn. You should just read the books. =D