What should I do inside the farmhouse?

Hint 1 of 8:

As with all adventure games, begin by checking your inventory to see what
you're carrying.

Hint 2 of 8:

That bag laying on the floor looks interesting.

Hint 3 of 8:

Open the bag and Gabriel will take everything he needs.

Hint 4 of 8:

Did you notice the newspaper laying on the table?

Hint 5 of 8:

Read the paper and you'll learn that Kommisar Leber is heading up the murder
investigation.