Past Perfect (czas zaprzeszły) - perfect means before, so
Past Perfect refers to an action in the past that was completed
before another action in the past.
I had seen him before.
We finished work at 6 o'clock.
Where had you been before?
Had he already left?
When I got home, I found that someone
had broken into my room and
had stolen my DVD player, so I called the police.
Past --> My DVD player was stolen --> I arrived home --> I called the police --> NOW