In the Shadow of the Moon
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A vampire reappears every 9 years to kill people, she also seems able to travel through time.
Of course, nobody believes the cop in charge of the investigation. As a result, he gradually loses his mind trying to figure out the mystery.
Unfortunately, everything is revealed during a never-ending dialogue that put me to sleep. I still don’t know why the time-traveller vampire was killing all these people and I will probably never know because I’ve lost all interest. It wasn’t badly acted though, but that’s about all I can say about the movie.