Maps are honest in ways people are not. That is why Vesper became a mapmaker, and why, at sixty-one, she is the last one the kingdom bothers to employ. It begins with the harbor chart of Sel. In the margin, where she would normally ink the guild's seal, there is a door. Small, neat, arched, drawn in a hand she doesn't recognize — which is impossible, because she drew this map herself, forty years ago, and Vesper recognizes every line she has ever made the way mothers recognize footsteps. She pulls the old survey of the northern passes. The door is there, tucked into a cliff face. The river atlas: there, on an island that doesn't exist. The palace floor plan, the smugglers' chart she keeps illegally, the half-burnt map salvaged from the war — there, there, there. Always the same door. Always somewhere no one would look. In forty years of copying the world onto paper, Vesper has learned its every wall. She had stopped believing the world could surprise her. She packs a satchel the same night: ink, bread, the harbor chart, and the brass key her predecessor left her with a note she never understood. The note says: "For when it starts appearing."