George has caught a cold due to bathing in the sea in April and, as such, is unable to join Julian, Dick, and Anne on their planned caravan trip.

George is on the mend from her cold, so she writes a postcard to let Julian, Dick, and Anne know that they should meet her at the railway station the next day.

Performers include Alfredo the Fire-Eater, Bufflo the Whip Cracker and his assistant Skippy, Mr. India Rubber, and Mr. Slither, the snake-man.

While Jo and the children are enjoying a picnic on the hill, Dick spots a face in the window of the castle tower.

The children are convinced that the face in the window must belong to one of the missing scientists, but when they search the grounds the next day during a tour of the castle, they find no evidence.

Julian learns from the ticket lady that two men from the Society for the Preservation of Old Buildings visited the grounds yesterday.