After the death of their father three sisters, sixteen year old Lou, Charly who is in her early twenties and Emmie who is a mere child, have to try and run the family's horse farm between them. They have to overcome all manner of adversity in order to keep their beloved farm.
Granny Jantzen lives with her three granddaughters Dick, Dalli and Angela on the small pony farm Immenhof in Northern Germany. Since the breeding of ponies isn′t profitable anymore, Granny Jantzen is struggling to keep the family property. During the summer break , young Ethelbert is spending his holiday with his cousins at Immenhof. While Angela has fallen in love with the wealthy land owner Jochen von Roth, Dick and Dalli have to put up with bigheaded urbanite Ethelbert.
The Immenhof has been closed by officials, awaiting auction. In the meantime, Angela has died, so Jochen is now a widower. Oma Jantzen and Angela's younger sisters Dick and Dalli live with him in the forester's house. In order to save the manor house, Dalli has started a "pony circus" with the village children in the barn, while Dick has given up hope of Ethelbert ever returning.
The pony hotel has just been opened, but so far no guests have arrived. Dick gets Ralf to design a brochure about the hotel. The girls and Ethelbert then lead the village children on horseback to Lübeck, where they all distribute the brochure - not knowing that Dalli has added some embellishments to the text.