What is the cliffhanger in the end of chater 13 of Fever 1793?

In the end of Chapter 13 of "Fever 1793," the cliffhanger is the sudden arrival of a man at the coffeehouse looking for Mattie's mother, who has not been heard from for days. This sets up a suspenseful situation, leaving readers wondering about the fate of Mattie's mother and what will happen next.