Clive and Carter lock Billy into the cabin of the boat; Billy finds a flare gun to signal for help.
Billy follows Miss Wood around the caves and watches her dig the artifact up with Clive in hot pursuit.
Billy follows Miss Wood towards the caves and runs into Clive.
Ann recognizes Carter as the man who stole the newspaper messages, but Jack Dunbar dismisses her claim.
Clive and Carter break open Miss Wood's bags but fail to find the artifact; Billy makes a discovery on Carter's boat.
Carter makes off with Miss Wood's bags at the train station; Ann gets a history lesson at the museum.
Clive arrives at the cottage to find Miss Wood terrified, having read the latest threatening message.
Ann brings the newspaper messages to the police, but Carter sabotages her car and steals the messages.
Ann goes to talk to the archaeologists to try to find out why the dig at Battle was abandoned.
Billy finds a newspaper with words cut out of it and realizes it has been used to write an anonymous message.
Uncle Augustus rescues Nathan from Bob Trimby.
Revising the spelling rules; doubling consonants; changing y to i; plural nouns.
A revision programme looking back over adverbs, adjectives, rhymes, spelling, punctuation, etc.
Josie and Peter meet the Scarecrow and help him to sort out compound words.
Zzaap recovers, but now he is green instead of blue; Hamish struggles with adverbs.
Children travel through a mystery world, solving word clues.
The children discover Grainger's secret.
The children discover a secret tunnel leading from the quarry.
Mary follows Grainger on one of his excursions.
Mary searches for evidence that Grainger is a spy.