After years on the run, Sickan reunites with Vanheden, Harry and Doris for another coup. The plan, timed to the smallest detail, is to steal a complete T-Rex skeleton from the Natural History Museum and sell it to the unscrupulous businessman Wall Enberg for 320 million SEK. However, they have not counted on Rigmor Gren, an aged criminal, obsessed with the idea of ​​bringing Jönsson to justice before she herself retires.

Allsång på Skansen is a Swedish tv show held at Skansen, Stockholm, every summer on Tuesdays. The audience is supposed to sing-along with musical guests to well-known Swedish songs. The show started in 1935 on a small scale - about fifty people in the audience. Today about 10 000–25 500 people come to each performance.