The team learns about the Sender, a man named Ledroptha Curtain. It is a mystery why the secret messages are only broadcast a few times a day, through very weak signals.

Reynie guesses that the Sender is saving up his messages for some new purpose. Constance thinks the Sender will start boosting the strength of his messages. Mr. Benedict says the Sender will begin transmitting his messages directly into people’s minds, without the need for other signals. He does not know why the Sender plans to do this, which is why the children must infiltrate the Institute, to find out.

Mr. Benedict explains that those like themselves who have resisted the Sender’s messages will no longer be able to, and he fears they will be subject to “special attention.” These words frighten the children. Reynie trusts Mr. Benedict but wonders if doing so is wise.

Sticky helps Reynie and Kate improve their Morse code skills. Constance composes an unpleasant poem about the other three then goes to bed.

Kate insists that Constance cannot be included in their team, as she is too cranky and clumsy, and not especially bright. Sticky agrees that Constance will make their mission harder.

Reynie goes to Mr. Benedict’s study, uncomfortable about bringing up Constance.