Be a super sleuth with the case of the stolen paintings /
Ecke, Wolfgang.
Humphries, Stella.
Humphries, Vernon.
London Methuen
1979
Spine title: The case of the stolen paintings. - With answers
'Originally published in Germany by Otto Maier Verlag Ravensburg ... 1972, 1973, 1974 ... in volumes entitled: "Solo für Melodica" "Das Geheimnis der Alten Dschunke" and "Das Hans der 99 Geister"' - title page verso
Children's literature, German.