What really happened in Haute Tension?

Recently, I saw Haute tension a.k.a. High Tension.

I could follow the movie well until the weird twist in the end where we are shown that Marie and the killer is the same person (in Marie's body). I thought the ending was a bit incoherent as the movie couldn't support the idea of Marie having a second, murderous personality. Where did she find the track? How did she crash?

But a friend of mine told me that it is the other way around, Marie is in reality the serial killer, and all the other scenes with her as "Alex's friend" are in her imagination.

I like the second theory and it satisfies me more, but I don't think that this one can be supported by the scenes either. So, what really happened? Are there any further hints or evidence as to what was reality and what wasn't?

plot-explanation high-tension

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What really happened in Haute Tension? - Young man in sleepwear suffering from headache in morning

What really happened in Haute Tension? - Desperate evicted male entrepreneur standing near window

What really happened in Haute Tension? - Couple Sitting on the Couch

Where was high tension filmed?

2. The French title translates both to \u201chigh tension\u201d and \u201chigh voltage.\u201d They considered other English titles including Switchblade Romance, \u201cbut it was maybe too campy.\u201d They settled on High Tension as it very clearly summed up the intended feel of the film. 3. They filmed in Romania, near Bucharest.

Is high tension based on intensity?

Intensity is a novel written by Dean Koontz in 1995. A two-part miniseries was produced in 1997 that aired on the Fox network. High Tension is a 2003 French film directed by Alexandre Aja. The first half of all three works have virtually the same plot.

What language is high tension?

EnglishFrenchItalian

Is high tension in French?

High Tension (French: Haute Tension, French pronunciation: \u200b[ot t\u0251\u0303sj\u0254\u0303]; released in the United Kingdom as Switchblade Romance) is a 2003 French slasher film directed by Alexandre Aja, co-written with Gr\xe9gory Levasseur, and starring C\xe9cile de France, Ma\xefwenn, and Philippe Nahon.

HIGH TENSION (2003) Ending Explained

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Images: Andrea Piacquadio, Andrea Piacquadio, Andrea Piacquadio, cottonbro