Schoolkids Moritz and Julie Fuchs's lives are greatly complicated by their single-raising mother Alexandra's all but lucrative obsession to prove herself an an inventor. Earning the rent and interest on debts in a laundry, she meets mysterious gentleman businessman Gregor Sand, who appreciates her honesty to return cash in his suit pocket. They bond over their dogs, he saves hers -winning the kids' vote- and consider commercializing one of her inventions, presented by the kids, but she's already involved for the expensive patent with dishonest school friend Fiona.
—KGF Vissers