New girl Angela Appleby is a pretty and clever girl. But soon someone is playing nasty tricks in class and the girls begin to wonder if Angela is as nice as she appears.
Carol Smith starts getting romantic cards and gifts from a secret admirer. But as she already has a boyfriend who is getting jealous, she turns detective to find out who the secret admirer is.
Plot:
Hannah wakes up in a caravan with her dog Herbie and no memory at all. Her parents Rita and Jack Peacock say they are travelling traders, but then Hannah uncovers a clue to a different story about her past and sets out to unravel it.
Plot:
Terri Gregson and other pupils have to stay on at Treetops Boarding School over the summer holidays. But the school is said to be haunted and then strange things start happening.
Plot:
Tracy Wilson is puzzled by her new neighbours, the Flemings. Mrs Fleming is not friendly while the daughter Alice becomes friends with Tracy but behaves in odd ways.
Plot:
Linda Loweth is a rider who is delighted when Tracey Perls moves in next door. Linda gets puzzled when Tracey seems to hide the fact that she likes horses and starts to investigate the mystery.
Alison and Kit Lawson are spending the summer holidays with Aunt Vera. They befriend a strange girl called Emma. They realise Emma is a ghost and set about unravelling the mystery about her.
The morning after a dreadful storm, a mysterious new girl named Mystine Marsh turns up at Grey Towers Boarding School and everyone treats her like an old friend. Only Lynne Barnes realises there is something strange about Mystine.
Plot:
Penny Farrell is a rising tennis star as the result of her partnership with T Jones. But there is something strange about T Jones, who seems to have powers of precognition.
Rambling over the wild cliffs near the Scottish fishing village where she lives, Aileen Andrews, sees a pigeon shot down. On its leg she finds a message saying that her brother, Hector, who was presumed lost at sea, is a prisoner on Misty Island. Dirk, the man who, shot the pigeon down, discovers that Aileen has read the message and forces her back to the motorboat in which his companion, Angus, is waiting to take him back to Misty Island.