Jean Kingsley is puzzled by Meryl, a new girl at Fircroft School. Meryl claims to come from the East, but her behaviour is strange, and her hair is a greenish tint that becomes more noticeable, when she is deprived of sunlight.
Someone is playing nasty tricks on Steve. Steve’s girlfriend Nicola turns detective to find the culprit.
Jean Douglas and Myrna Lewis, fourth formers at Herondale Boarding School are returning after breaking bounds one night, when Jean sees a strange flash in the sky. Jean finds a glowing ball on the grounds and picks it up. The next morning all the girls are shrunk smaller than the ball which then starts to open up.
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Orphan Terry Martin is engaged as household help by elderly Mrs Cavendish. Terry is puzzled by the odd behaviour of Mrs Cavendish and her grim maid, Ellen, and by the fact that Mrs Cavendish seems to have chosen her more for her appearance than her abilities. Terry has a glimpse of a girl in the house who says her name is Cynthia, and she asks Terry for help, then isn’t seen again.
Plot:
Tim and Tracey Waring’s father owns the pearling lugger, Tern; anchored off the West Coast of Australia. He and his crew disappear while the twins are ashore and when they report to the police, they find the two missing Filipino divers there. One has been attacked underwater and the police suggest that Mr Waring or his engineer, Jim Cartwright, could be responsible. When Tim and Tracey return to the Tern they find a stranger on board.
Deep Sea Danger – Judy: circa 394 (29 July 1967) – (?)
When Jan Rosson hears that an avalanche has killed members of a geological expedition in Emalia led by her father, she flies to the capital, Melange. She learns that her father is accused of an act of cowardice that led to the disaster. The British Consul tells her that her father has also been killed, but Jan refuses to believe this.
The Silver Secret – Judy: #381 (29 April 1967) – #386 (03 June 1967)
Government experts are investigating a fantastic noise which, from time to time, strikes Tatany Heights School. One of the experts, Mr Tenby, claims that the noise is caused by low-flying jet planes, but his companion, Mr Mountjoy, goes to investigate the downs near the school, where Pat Sims and Anne Dennis have seen weirdly-dressed figures. When Pat and Anne go to warn Mr Mountjoy that Mr Tenby is impatient to leave, he vanishes before their eyes. 
The Sound of Fear – Judy: #372 (25 February 1967) – #381 (29 April 1967)
Since Jill Redfern’s arrival at Greystones school, three fires have mysteriously started, the latest one in the laundry. Jill finds a box of capsules which she believes have something to do with the fires. She suspects Jeremy Grimthorpe, the previous owner of Greystones, of being the fire raiser, but cannot convince her head-mistress, Miss Maybole.
Mandy and Jane see a young boy’s face at a barred window of a big house—and fear he is being held prisoner. They become even more anxious when they see the boy tracing the word HELP on the window and decide to call at the house. At first no one answers but then they hear someone coming to the door.
Orphan Flo Shaw is staying with Tansy Morris, whose parents own the Stage Coach Inn. Flo seems a sweet girl, but sometimes behaves rather oddly. A guest at the inn, Lord Heade, believes that a Mr and Mrs Smith, who own a fair-ground and are in hospital after a car crash, may be related to Flo.
