After years on the run, Sickan reunites with Vanheden, Harry and Doris for another mission. 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 police detective, obsessed with the idea of bringing Jönsson to justice before she herself retires.