Boom-Boom, a house painter living in Donald Duck's neighborhood, thinks he discovered a S.O.S. from an imprisonned french artist on the back of one of the paintings displayed at the Duckburg museaum. He asks Gyro Gearloose and Donald Duck to go with him to France and free the poor man. On their way, they meet Tintin who offers to help them in their loonatic investigations.
- This story was first published in November of 2003 in Topolino n°2501.