Arsène Lupin S01 E09 The Caliph's Chimera

In Ungoldingen, at the small railway station, two unusual characters, the famous London detective Fox and his assistant Robertson, entrust their luggage to a porter who immediately disappears after leaving them a calling card bearing the message: “Arsène Lupin welcomes you”. Despite this incident, Fox and Robertson make their way to Augstadt Castle, where the owner, Baron von Augstadt, awaits them.