The children head to the cannon described in Mr. Benedict’s clue. Kate disguises herself and approaches the cannon, which has an envelope stuck to it. As she makes her way back to her friends with the envelope, Reynie sees Jillson come around the corner of the castle. Jillson does not immediately recognize Kate, though she is suspicious of her. The children make their way out of the castle grounds as quickly as possible. Their next clue leads them to the train station and includes a key to station locker number 37.

On the way to the station, they attempt to contact Captain Noland by radio, but they cannot get through to him. Locker 37 contains another envelope and some money. The envelope tells them to use Constance’s gift to determine what to do next. This is an indirect reference to the necklace that Mr. Benedict gave her. Kate looks through the crystal on the pendant and sees a miniature map of a city called Thernbaakagen, along with a hotel address. The children rush to buy tickets for the train to Thernbaakagen, which leaves in 10 minutes. Jackson and Jillson arrive at the train station just in time to see Kate getting onto the train, but before they can pursue her, a businessman accosts them.