You thank the group for their information and then inquire if they noticed anything else that might be relevant. The quiet and observant individual speaks up, their voice calm and measured.

"I did notice a man in a dark coat sitting alone at a corner table," they say. "He seemed to be observing the dining car, his gaze shifting from person to person."

This new piece of information adds another layer of intrigue to the case. It seems that there might be multiple individuals of interest on the train.

What would you like to do next?

1. Thank the group for their cooperation and move on to question someone else.

2. Inquire if the group noticed any specific interactions involving the observant man.

3. Head to the observation car to investigate the note you found earlier.