Nasko is left at his grandma’s Fany for the summer, while his parents are working in Spain. Nasko unites with the kids from the neighbourhood – Petyo and Vesi – against their scary neighbour with a scar on his face – Dachko. After unsuccessful attempt to ambush Dachko they lose the slingshot they have borrowed from grandad Mitko. Determined to get it back, Nasko gets everyone involved in an uncomfortable situation that unravels the mystery of the odd man Dachko.