A decent translation, but maybe not quite idiomatic. Herantasten or annähern instead of schleichen feel more appropriate.

Oh so the word for "creep" they used in German is appropriate for the metaphorical meaning of "investigating/watching"? Does the most direct dictionary translation of "creep" happen to fit here?

If the translator figured out that this is a figurative meaning and intentionally picked a suitable translation, I'm very impressed!