Tia and Cara both travel for their esper work, and like good partners with tricky backlashes, they go with each other so they can be on-hand for guiding and moral support.
This week, Tia had a case in Toronto that she's better suited for than Epione (the client is rich and busy, and would rather fly out the esper with a much shorter list of requirements than miss their important meetings because the local anesthesiologist is so touchy). Cara is a good partner, and so now she's in Toronto too, for the first time in almost a year.