Also, "anyone following us" is a little vague for a spirit - just as fair warning before you tell it what you want.
Quick question: Its logic and intuition are both 4, that isn't high enough to get the drift of what I would be asking?
The problem lies in spirits understanding of the world. Their native planes of existence are quite a bit different. What a spirit interprets "anyone" to mean is really open to a lot of interpretation.
If worded as report on "anyone following us", it would likely quickly report that the 3 gentlemen in the car behind you were following you.
If what you are concerned about is projecting humanoids or trailing spirits in the astral plane, ask it to monitor for those things within X distance of you for example. Or awakened beings (although you would have to exclude your adept teammate).
Spirits generally won't follow overly complex orders very well, but the better you define what you want it to do, the more likely you are to be pleased with the outcome.