Our yard has a secret

The story holds not only adventure and a captivating mystery but also a tale of friendship between Ondra and Johanka. Will they let Erik join their group? Ondra lives in an ordinary Prague tenement building that looks innocent from the outside but hides an unexpected surprise in the corners of its courtyard. A mysterious creature lurks in one of the cellars, and Ondra and Johanka embark on a thrilling nighttime investigation. As if that wasn't enough trouble, Ondra learns that his hated cousin Erik will be staying with them for a while. He'll take up half of his room, play with his toys, and his parents will pay more attention to him than to Ondra. This calls for cruel revenge…