Hi Shika/Noah
Congratulations on your account anniversary! I'm sending this review in honor of the occasion. 
Positives
The detail and description in this piece is excellent. You do a great job of establishing tone and letting the tension play out not just by telling the reader, but by showing the audience. This is a skill that even longtime screenwriters don't always do well, so the fact that you can so clearly create a visual image in the reader's mind on your first screenplay is really impressive. Nice work!
Suggestions
In a screenplay, you typically only describe what can be seen and heard, since the other three senses (taste, touch, smell) are not something the audience can experience. In a line like, "The heat wraps around her like a blanket, the dry scent of eucalyptus and distant petrol lingering in the air." I'd remove everything after "blanket" because the last part of that line about the eucalyptus and the petrol scents aren't information that any department of a production can convey to the audience.
I noticed a tendency to repeat the same information over and over again. As Alexis arrives at Pernilla's apartment and crosses the courtyard, she drums her fingers on the cover of her notebook and "the tapping echoes the rhythm of her wandering mind." Then, just one scene later, she's again tapping her notebook lightly against her thigh, "matching the nervous rhythm of her mind." Once you've established a character behavior, you don't need to keep over-explaining the rationale behind it. After you first explain the character motivation behind the tapping, you can then just mention that she keeps tapping something in subsequent scenes; the reader doesn't need to always be explicitly told what the motivation is time after time after time, unless it changes substantively.
While camera directions are perfectly fine, be sure that you're not taking away from the narrative quality of the storytelling. When Alexis is waiting outside the door, there were a lot of instructions for SFX, reverse shots, close-ups, etc. And that stuff is perfectly fine when used sparingly (or if you are planning on directing this yourself), it can distract from the read if your goal is to tell a compelling story that will make a producer want to buy it, or an actor want to play the role. For me personally, I'd cut down on the camera directions by about half, reserving it for only the most key moments when capturing what you're going for just cannot be accomplished narratively any other way.
The big-picture issue I had with this script is that Alexis' motivation is unclear. You do a great job of setting up the atmosphere and making it tense, uncertain, etc. as Alexis approaches Pernilla's apartment. And that makes sense, because she's apparently there to ask questions about the brutal murder of someone that Pernilla worked with. And yet, when a complete stranger (Harold) opens the door to her apartment and offers no real explanation for why he's there (which the narrative tells us Alexis finds disconcerting)... and yet Alexis just walks into the apartment and starts asking him questions? I think you need a more compelling reason for why she does something against what I think would be most people's better instincts. Does she need this story for some reason? Tell us why.
Overall
Overall, I think there's a lot of potential in your script. The technical screenwriting elements have a strong foundation and can be finessed rather easily with a quick rewrite. The actual story elements themselves need a little more thought and development in order to take them to the next level, but I do think you're off to a good start. Nice work!
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Respectfully,
Jeff  
"Rating & Reviewing Philosophy" 
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