How do I recover the stolen umbrella?

Hint 1 of 8:

The thief is running around town.  Maybe you could catch up with him.

Hint 2 of 8:

He's faster than you are.

Hint 3 of 8:

So running isn't going to do you any good.

Hint 4 of 8:

But you might be to catch him another way.

Hint 5 of 8:

If you chase him long enough, he will eventually return to the square just
outside of the pharmacy.

Hint 6 of 8:

And he'll turn his back to the pharmacy.

Hint 7 of 8:

He might not notice you until it's too late to run away.