Leia didn't know Morse Code. She did, however, know how to spot a thread and follow her instincts. So when others she knew from the train began converging on a particular location, she went too, and followed their lead, ordering the same drink everyone else seemed to be ordering.

Which lead her here. "I may have some idea as to who, at least," Leia said. "On our last mission, we faced an entity capable of creating elaborate, large-scale illusions, ones that had enough physical substance to do direct harm even if the person knew it was an illusion and could see through it. It also has the ability to tap into people's minds somewhat, since it was able to generate tailor-made illusions based on our fears and desires. I would bet money that it was behind this somehow."

"As to why, I'm much less certain, but after we put a stop to its plans on that world, it mentioned wanting to find a home. So it's possible that it may have tried to create one, and then populate it. But I have no idea what it's goal beyond that might be. And if that's the case, all evidence is pointing to it not being nearly as successful as it hoped."