Hm, not sure how to make this tracking roll, Hairy.  I imagine its a survival roll, like it says on page 143 of the rulebook.  It also says that some tracking rolls are modified by investigation (which would give her a -1 on the check, since her investigation is lower than her survival).  Is that the case here?<br/><br/>Basically, what I'm trying to do is to have her chase the invisible Duponte down and tackle him...so would that be combined survival athletics?  Or combine all three skills here?  (Investigation, survival and athletics?)