Tatu and Patu, those strange brothers from Oddsville, are at it again! This time, they're headed by train to Helsinki to visit their cousin Jori. Their host is in a terrible hurry, though, and Tatu and Patu are left to race around Helsinki's tourist sites - until they lose track of both time and Jori! Tatu and Patu must search the city for their cousin, through the Linnanmäki amusement park, on trams and subways, and at the Korkeasaari zoo, and even take their cause to the front steps of the parliament building. Finally they find Jori, and learn the secret behind Jori's mysterious steaming suitcase!