Marion Taylor is being looked after by her Aunt Madge and Uncle Wilf, who are cruel to her. She takes solace in her music box, which is magical. As Marion is the thirteenth girl to own it, she can travel back in time to meet the previous owners of the box.
Andrina Faye is Britain’s top girl pop star and her records all hit the Top Twenty. But this is because Mr Faye is blackmailing Jill Summers into using her voice for the recordings by threatening to get Mr Summers sent to prison for embezzling. Then Jill discovers that Mr Faye framed her father.
Anna Graeme goes to Cornwall, where her father leads a team of men prospecting for oil. But this threatens the home of the piskies, so they take Anna prisoner in a bid to stop the “Terror” as they call it. Anna also finds herself caught in a power conflict between Benito and Aggro. This culminates in Aggro ousting Benito and throwing him in the Blow Hole to drown. Benito’s followers help Anna to escape and they set out to rescue Benito.
Miss Harriet Dene, a renowned woman scientist, has brought up a girl known only as J. Smith on a remote island in the Hebrides in an experiment to make her a perfect specimen, both physically and mentally. Deciding “Jay” is ready, Miss Dene takes her to the mainland to put her to the test with a barrage of practical tests.
Other Appearances:
When Reyna Reynolds moves into the empty house next door to Jan Crawford, strange things start happening. The strangest of them all is that Reyna casts no shadow. Jan decides to pretend to be friends with Reyna in order to unravel her secret, although Reyna causes a lot of trouble for Jan.
Della Dolwyn does not win at anything like her sisters Helen (ballet) and Elaine (swimming) and receives constant put-downs because of this. Della resolves to win at something. She settles on synchro swimming and sets out to form a team in secret.
Olga is an orphan who earns a meagre living from singing and dancing around the countryside. She is taken in by the Dent family who promised a fine future, but they just want her as a slave and keep her prisoner.
Nicky Jones is delighted to receive a Victorian doll named Emmeline for her 13th birthday. Then Nicky realises Emmeline is evil and causing accidents around the place, but cannot convince her parents.
Eventually, Nicky discovers Emmeline had been sent to her by mistake; there was confusion with an elderly Miss Jones. When Nicky takes Emmeline to the correct address, she discovers Miss Jones has a male Victorian doll, Emmeline’s partner. Once the dolls are reunited, Emmeline is at peace and the trouble ceases. 
On a farm in Kentucky, Annie Parker has ten orphaned nephews – all of whom are older than herself. The nephews are accustomed to being waited on hand and foot by their mother and expect Annie to do the same. But Annie always gets her own way with the nephews in the end, such as getting them to attend church or mend the roof.
Other Appearances:
Sandra Cook loves cooking and enters the “Queen of the Cooks” contest. She is winning heats, but has a big problem in that her cookery teacher, Miss Barker, hates her.
