Billie is a girl with a BIG problem – her mum's getting married again, to an OLD MAN! Billie just knows she's going to be teased to death about her boring, bald stepdad. But worse than that, with a posh new stepsister and a mum who hardly seems to notice her now, she doesn't feel she belongs in her own family any more. Billie would much rather live with her best friend, Archie, whose parents are young and trendy. So she comes up with a great idea: The Parent Plan. All she needs is to get adopted into a new family – easy! Or not. With her head in the clouds, Billie becomes a girl on a mission. Will she come back down to earth with a bump?