NPC
The Zhentarim Guard
The strange person the party noticed watching them at the Phandalin inn on their very first night in town (Session 1). Nothing came of it at the time.
Three sessions later, the same figure was standing guard outside the Miner’s Exchange while Guildmaster Thornton leveled crossbows at the party — one of her Zhentarim people, and proof the Black Network had eyes on the party from the start (Session 4).