In the busy square, no voices stood out. Odin could catch words, sounds, but then that would be drowned out by another voice. If he wanted to, he could probably home into a specific voice, but he honestly doubted that anyone would actually provide any reason to gain the Lich's curiosity. It turned out that there was one, one human that could do this, and it was because of a few words, a few names, that Odin honed in on her position.
Alice, Anton, Tanya. Three names that, if said separately, meant nothing to Odin, as they could refer to anyone, and none of them were entirely uncommon names. However, when spoken together, they told a story of who was uttering them. Whoever it was, they knew Alice Sokolov, wife of Konstantin Sokolov, and also knew their two children, Anton and Tanya. At the mention of those names, Odin followed the sound of the voice that had spoken, thankful that the female voice, for it was a female, had continued speaking, allowing him to follow the trail.
It turned out that there was no following required, as she was walking in his direction. Waiting a few moments was all that would be required for Odin to stand in front of the woman. If she noticed him, Odin would say nothing to her, and wait to see what she would do. If, somehow, she remained oblivious to the Lich's presence, then Odin would simply follow her and see where she would lead him.