A gang of five children spend their summer in an abandoned factory complex. When they are forbidden to go there by the factory owner for safety reasons, the children decide…

Lotte gets a little sister named Roosi. Two scientists Karl and Viktor come to Gadgetville, they are taking part in a big folk song collecting competition. Whoever succeeds in recording…

Plucky young Lotte embarks on an adventure with her uncle Klaus to solve the mystery of three stones that a pair of hooded figures are attempting to retrieve.