"On stage!" it is for the students of Miss Cornfield's class at Winterstein School, as they are planning a play, specifically "Robin Hood." Helene and Anna-Lena both long for the lead role, and Schoki will now, much to his dismay, receive daily acting lessons from his grandfather. Even more than the play, Ida is looking forward to her best friend Miriam, who will be visiting for a few weeks and also wants to go to school with her. Before Ida's move, they were best friends and never had any secrets from each other. Can she keep the secret of the magical animals from Miriam? Hardly ... But what will Miss Cornfield think if she breaks the vow? Yet her teacher has other concerns: Who on earth is digging the countless holes on the school grounds at night? The whole school is puzzled. If this continues, the auditorium will have to be closed, and then the play cannot take place either ...