My question is:

Psychic investigators or Psychic detectives: Do they work with Qareen (Jinn companion)? Mediums also use Qareen?

Sura: Al-A'raf (The Heights) Sura # 7 Verse # 143

And when Moses arrived at Our appointed time and his Lord spoke to him, he said, "My Lord, show me [Yourself] that I may look at You." [ Allah ] said, "You will not see Me, but look at the mountain; if it should remain in place, then you will see Me." But when his Lord appeared to the mountain, He rendered it level, and Moses fell unconscious. And when he awoke, he said, "Exalted are You! I have repented to You, and I am the first of the believers."

Sura: Al-A'raf (The Heights)
Sura # 7
Verse # 143

By the star when it descends,

Sura: An-Najm (The star)
Sura # 53 Verse # 1
By the star when it descends,

Trojan horse (computing)

Uses of a Trojan horse

When a Trojan horse becomes active, it puts sensitive user data at risk and can negatively impact performance. Once a Trojan has been transferred, it can:

Give the attacker backdoor control over the computing device.
Record keyboard strokes to steal the user's account data and browsing history.
Download and install a virus or worm to exploit a vulnerability in another program.
Install ransomware to encrypt the user's data and extort money for the decryption key.
Activate the computing device's camera and recording capabilities.
Turn the computer into a zombie bot that can be used to carry out click fraud schemes or illegal actions.
Legally capture information relevant to a criminal investigation for law enforcement.

https://searchsecurity.techtarget.com/definition/Trojan-horse

Sura Al-Mulk, Sura # 67 Verse # 19

Whenever I see a bird flying in the sky -- I just utter Al-Mulk because I don't know these verses by heart.

Do they not see the birds above them with wings outspread and [sometimes] folded in? None holds them [aloft] except the Most Merciful. Indeed He is, of all things, Seeing.

https://quran.com/67

not a leaf falls, but He knows it.

Whenever I pass by and a leaf falls I utter this: not a leaf falls, but He knows it.

“And with Him are the keys of the Ghayb (all that is hidden), none knows them but He. And He knows whatever there is in the land and in the sea; not a leaf falls, but He knows it. There is not a grain in the darkness of the earth nor anything fresh or dry, but is written in a Clear Record”

[al-An’aam 6:59]

Is man’s fate pre-destined or does he have freedom of will?

https://islamqa.info/en/answers/20806/is-mans-fate-pre-destined-or-does-he-have-freedom-of-will

Source: Islam Q&A 

Question # 20806
https://islamqa.info/en