Ellie's glorious romance with Russell is teetering on the rocks. Magda's lost her pet and is desperately upset (though the others didn't even know she still had a hamster!). And Nadine is fed up with the other two lecturing her about the dangers of meeting someone on the Internet. She thinks an e-mail boyfriend is wonderful! Buckets of tears are wept and hundreds of tissues sniffled into. Can the girls' friendship survive these testing times?

Fourteen-year-old Prue and her sister Grace have been educated at home by their controlling, super-strict father all their lives. Forced to wear Mum's odd hand-made garments and forbidden from reading teenage magazines, they know they're very different to 'normal' girls – but when Dad has a stroke and ends up in hospital, unable to move or speak, Prue suddenly discovers what it's like to have a little freedom. Sent to a real school for the first time, Prue struggles to fit in.

India lives in a large, luxurious house with a mum she can't stand and a dad she adores, though he hasn't had much time for her recently. She seeks solace in her journal, which she keeps in sincere imitation of her heroine, Anne Frank. Treasure lives on the local council estate with her loving and capable grandmother. She is devoted to her nan but lives in fear of having to go back to live with her mother and violent stepfather. A chance meeting sparks a great friendship between the girls.

Sylvie and Carl have been friends since they were tiny children. They've always played together, called each other boyfriend and girlfriend and, deep down, Sylvie has always believed that they'd end up married to each other. They even have a magical fantasy world that belongs to them alone.

When life with Jayni's violent-tempered father becomes too frightening to cope with, Jayni, her mum and her little brother Kenny are forced to escape in the middle of the night. Slipping out of the house unseen, travelling up to London by train and checking into a hotel – it's almost like playing an elaborate game. They even make up false identities to protect their secret, and Jayni becomes the glamorous-sounding Lola Rose.

Dolphin adores her mother, Marigold. She's got wonderful clothes, bright hair and vivid tattoos all over her body – a colourful lady, to match her colourful life. But Dolphin's older sister, Star, is beginning to wonder if living with Marigold's fiery, unpredictable moods is the best thing for the girls.

Frankie is nearly 14, and teenage life certainly comes with its ups and downs. Her mum is seriously ill with MS, and Frankie can feel herself growing up quickly, no thanks to Sally and her gang of bullies at school. When Sally turns out to be not-so-mean after all, they strike up a friendship and are suddenly spending all of their time together. But Frankie starts to wonder whether these feelings she has for Sally are stronger than her other friendships. Might she really be in love?

Em adores her funny, glamorous dad – who cares if he's not her real father? He's wonderful to her, and to her little brother Maxie and sister Vita. True to form at Christmas, Dad gives them fantastic presents, including a real emerald ring for his little Princess Em.Unfortunately he's got another surprise in store – he's leaving them. Will Dad's well-meaning but chaotic attempts to keep seeing Em and the other children help the family come to terms with this new crisis?

Quiet, cautious Pearl has always adored her bold, brash, bad big sister Jodie. When their parents get new jobs at a grand, fusty old boarding school, Melchester College, the girls have to move there – and when they arrive, things start to change. Jodie has always been the leader – but now it's Pearl who's making new friends. Jodie just seems to be getting into more and more trouble – arguing with Mum, scaring the little children, flirting with the gardener.

When Laura meets a French exchange student, Leon, she is flattered by his interest in her. She's never had any sort of boyfriend before. One night, Leon walks Laura home and her life will never be the same again. Things start to change for Laura and she doesn't even know how it could have happened. When her family learns her secret, they are horrified. Sent away to save them from shame, Laura meets girls just like herself, whose families have given up on them - and they become a family for each other at the most difficult time in all their lives.

Hi! I'm Charlie (DON'T call me Charlotte – ever!). History is boring, right? Wrong! The Victorians weren't all deadly dull and drippy. Lottie certainly isn't. She's eleven – like me – but she's left school and has a job as a nursery maid. Her life is really hard, just work work work, but I bet she'd know what to do about my mum's awful boyfriend and his wimpy little son. I bet she wouldn't mess it all up like I do ...

Violet has always been in the shadow of her mesmerising, controlling brother, Will - by turns delightful and terrifying. Now that Will has learnt a shocking secret about his own past, things seem to be getting worse. Violet retreats further into her fantasy world built around the fairy characters created by her favourite author, Casper Dream.

Lily isn't home alone – but she sort of wishes she was; looking after her three younger siblings is a lot of responsibility. When Mum goes off on holiday with her new boyfriend and her stepdad fails to show up, Lily is determined to keep the family together and show they can cope without any grown-ups. But taking care of six-year-old twins, her three-year-old sister and the family's flat feels overwhelming and Lily is worried that school or social services might discover their situation and break up the family.

Shy, mild Mandy has been bullied at school for as long as she can remember. That's why she is delighted when cheeky, daring, full-of-fun Tanya picks her as a friend.Mum isn't happy – she thinks Tanya's a BAD GIRL and a bad influence on her daughter. But Mandy loves spending time with her brilliant new friend, and is sure Tanya can only get her out of trouble, not into it ... or could she?

Sunset lives a life of luxury with her beautiful ex-model mum, her world-famous ex-rocker dad, and two little celeb siblings. But life on the red carpet is no compensation for rowing parents, constant nagging, intensive media scrutiny, and no real friends. Destiny, on the other hand, is an only child living on a rundown estate with a sickly but devoted mum who constantly tells her she's really the daughter of a famous former rock star...