@nathanbforrest45
I think you're right about the two not being connected. I didn't think of the Spanish kidnapping as an inside job but you may be on to something. And it did happen after the husband left for his meeting. I can't figure out who the wife's companion is. Maybe the wife has mental health issues..........
I also think they turned to Sarah to investigate because she's a women and they didn't think she would be competent to figure out the mystery.
OR - Maybe Libby and the Spanish dude were getting it on and she ended up as a patient who "lost" her baby or thought she lost her baby but the baby was taken by the Spaniards. That's why Libby was following the wife in the park.
It's awfully convenient that the female alienist showed up. I think the Uncle is paying her to get close to Kreizler to work her way into the investigation and get the scoop for his paper since the soon to be son in law won't work for him.