The Art of Conveyance and Round-Trippery

Reynie and Sticky are invited to join the Messengers and come face-to-face with the device behind The Emergency's secret transmissions – The Whisperer. After their previous mode of communication is compromised, Number Two suggests an alternative means of reaching the children. Kate and Constance follow a lead from Mr. Benedict to uncover a secret entrance to Dr. Curtain's lab, just as Dr. Curtain gears up to advance the next phase of his plan: The Improvement.