First crime.
Go through the first door.
Find the fake police badge.
Found the first Stella Porta contract.
Go back to the office.
Second crime.
Talk to the witness.
Discover the recipe.
Find Alex's corpse.
Go to the office again.
Third crime.
Read the extremist forum.
You have found the broken fence.
You have found the dirty boots.
You are in the office for the third time.
Get to the coordinates.
Find the cultist's lair.
Read the cultist's laptop.
Go to the portal.
Use the lever to open the door.
Enter the main menu.
You have crossed the portal.