Answer:
Hester recognizes a small, rather deformed man standing on the outskirts of the crowd and clutches Pearl fiercely to her bosom. Meanwhile, the man, a stranger to Boston, recognizes Hester and is horror-struck.
Inquiring, the man learns of Hester's history, her crime (adultery), and her sentence: to stand on the scaffold for three hours and to wear the symbolic letter A for the rest of her life. The stranger also learns that Hester refuses to name the man with whom she had the sexual affair. This knowledge greatly upsets him, and he vows that Hester's unnamed partner "will be known! — he will be known! — he will be known!"