Bea returns to her old school as a newly minted teacher after the legal traineeship. Full of anticipation, she takes this place, because she only connects beautiful memories with her school days. But the years have not passed without a trace at the Pestalozzi comprehensive school. Much has changed – and not exactly for the better. Unfortunately, only one thing at school has remained the same: Alexandra Lohmann, Bea's personal enemy from school days, is still working there – the two have a dark secret. There was a left-handed evening with her sister-in-law Miriam just right for distraction. But there will be an evening that for Bea, will have far-reaching consequences ... Luzi Beschenko is using the start of the new school year to pursue her idea of creating a music company. 
Unfortunately, due to the shortage of teachers, there is no teacher who could look after this working group. This changes with the attitude of Bea Vogel as a new music teacher. But Bea meets a small group of nerds, who are so impressed by the attacking hostilities of the It girls around Caro that they want to throw their heads int the sand on the first day. Bea has to muster all her persuasive power to change the kids...