Nexus, Part One: "Polaris"
It was something in the way that he held himself that gave him away. It was in the way he seemed to droop when not the focus of anyone's attention, and melted into the background despite his unusual appearance. It was in the silences that lingered between boisterous laughs that made Lizzy realize that Mr. Undertaker was like her: bent to the verge of shattering with grief (and it made her wonder about his relationship with her family, when Mother said that she had known him since childhood).
Lizzy couldn't encourage his laughter when she thought that so much of it was faked, or some sort of unhealthy coping mechanism to deal with so much death. But maybe, just maybe, she could encourage a smile. And when she managed to succeed, she pretended not to notice that Mr. Undertaker's little slips of information weren't quite as accidental as he pretended.
"Nexus" refers to a network.
"Polaris:" what they lost; a guiding star.