After a decade-long absence from the world of yellow tape and bloody corpses, Marg Helgenberger reprised her role as Catherine Willows Thursday on CBS’ CSI: Vegas. It seems her character’s so-called “retirement” — which involved serving on the board of the Eclipse hotel and mentoring young women in forensic science — wasn’t that fulfilling, so the episode began with her asking Maxine (Paula Newsome) for her old gig back.

Fortunately, there were a couple of job openings since Gil (William Petersen) and Sara (Jorja Fox) were never replaced after leaving at the end of last season. Apparently, the Grissoms are currently on a boat in the Arctic circle but in real life, Petersen only signed for one year on CSI: Vegas while Fox chose not to return for a second season.

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“The job is in my blood,” Catherine tells Maxine.

And with that, Catherine is immediately put to work at a “sex dungeon” where a dominatrix has been found murdered and very bloody. Catherine throws around phrases like “molecular map making” to show Joshua (Matt Lauria) that she’s still got it, but remains suspiciously quiet when he asks about her surprise return to the investigation unit. Catherine then gets a call and scurries off to some crowded area, where she thinks she sees a woman named Grace but can’t seem to catch her.

By the end of the episode, Maxine suspects there is another reason why Catherine wanted back inside the yellow tape. It turns out she mentored a…