Based on the Enid Blyton series about the St. Clare’s boarding school for girls, attended by twins Pat and Isobel O’Sullivan, among others. The series has been continued on in both the UK and Germany. In all the German St. Clare’s books, twins Pat and Isobel are renamed Hanni und Nanni, the setting is also updated from the 1940s to the 1960s, and quite a few other changes are made, including the school itself being renamed from St. Clare’s to Lindenhof. This episode finds Hanni and Nanni wondering if a new schoolmate is actually a real Princess. Suddenly Hanni mysteriously disappears and a frantic search for her begins. Text in German.