Tracy, a foster child, is living with Cam and starting a new school. Things seem to be looking up for Tracy - but then trouble begins. She has a horrible teacher, the other kids laugh at her, and things between her and Cam aren't going as well as expected. Tracy's friends, Alexander and Football, are having their own problems, too. Then one day, out of the blue, who should appear but Tracy's long-lost mum.

When my parents split up they didn't know what to do with me ... My family always lived at Mulberry Cottage. Mum, Dad, me – and Radish, my Sylvanian rabbit. But now Mum lives with Bill the Baboon and his three kids. Dad lives with Carrie and her twins. And where do I live? I live out of a suitcase. One week with Mum's new family, one week with Dad's. It's as easy as A B C. That's what everyone says. But all I want is to go home – back to Mulberry Cottage...

Jess and Tracy Beaker have found happiness in The Dumping Ground. Not that Dumping Ground - the children’s home that Tracy grew up in - but a seaside antique shop full of treasures, along with Flo, the owner, and Alfie, their dog. Jess is looking for a fantastic new boyfriend for her mum (mostly because Tracy’s awful ex Sean is back on the scene). But Jess has bigger problems of her own. She’s being picked on by a local kid who’s got it in for her. But when Jess uncovers the truth about her new enemy, it means big changes for the Beaker Girls....

Ruby and Garnet are ten-year-old twins. They're identical, and they do everything together, especially since their mother died three years earlier – but they couldn't be more different. Bossy, bouncy, funny Ruby loves to take charge, and is desperate to be a famous actress, while quiet, sensitive, academic Garnet loves nothing more than to curl up with one of her favourite books.

Amy, Bella, Chloe, Daisy and Emily are friends at school and have their own Alphabet Club (just look at their initials!). Daisy is the newest member and is desperate to fit in, even though Chloe is distinctly unfriendly to her at times. Throughout Daisy’s first year at the school, the girls plan ever-more elaborate sleepover parties for their birthdays. Daisy is dreading the time when her birthday comes round as she doesn’t know what her friends will make of sleeping over at her home, with her rather special older sister.

Katy Carr is a lively, daredevil oldest sister in a big family. She loves messing around outdoors, climbing on the garage roof or up a tree, cycling, skateboarding, swinging.... But her life changes in dramatic and unexpected ways after a serious accident. Inspired by the classic novel What Katy Did, Jacqueline Wilson creates an irresistible 21st-century heroine. Fans of Hetty Feather and Tracy Beaker will fall in love with Katy and her family too.

Floss's parents are divorced, and she divides up her week, spending five days with her mum, her new step-dad and her baby half-brother. The other two days Floss spends with her dad, helping him to run his greasy spoon cafe. But their simple arrangement is thrown into disarray when Floss's mum decides to move to Australia. Making the difficult decision to stay at home, Floss moves in permanently with her dad and they muddle along happily together, surviving on chip butties and enjoying visits to the local funfair.

"Where do baby apes sleep? In apricots! I'm Elsa, and that's one of my jokes (I tell LOTS of jokes and I'm going to be a big star one day). I do my best to cheer my family up - but no one seems to laugh much any more. Not since we lost our lovely house and had to move into a bed and breakfast hotel."

Being a sister isn't always easy ... but what's the very worst thing about your sister? Marty and her sister Melissa couldn't be more different. Marty loves her Converse trainers, playing football, hiding in her secret den and helping her dad with his DIY. But Melissa loves Justin Bieber and all things pink, girly and pretty. The sisters can manage to live together, despite their occasional scraps but then Mum tells them they have to share a room.

Beauty Cookson is no beauty. She's a plain, timid girl who constantly feels inferior to the super-confident, snooty girls at school. Worse than the teasing in the playground, though, is the unpredictable, hurtful criticism from her father. Beauty and her meek, sweet mother live in uneasy fear of his fierce rages, sparked whenever they break one of his fussy house rules.

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?

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 ...

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.

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.

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.