XIX century. Adventurers go in search of the briefcase of pirate captain Charles Robert Rumba, which, according to legend, contains the captain's treasures. However, instead of treasures, friends find something completely different... The second book of the dilogy - “The Gun of Captain Sundukker” - tells about events taking place in our time. A weapon that once belonged to a famous captain falls into the hands of modern schoolchildren. The collection also includes the story “Choki-chok, or the Knight of the Transparent Cat” - about adventures in the country of Australia, located “somewhere nearby.”