Rudolf's message in German wishes Carlos/Karl a right happy Easter, and discusses a package of books that was sent to him earlier, asking whether or not he had to pay duty on them.
The name of the recipient struck me because my great grandfather's name was Carl Dunkel. It took me by surprise, but as far as I know my great grandfather didn't spend any time in Spain. Here he is in Würzburg, Germany in the early 1940s. He was retired at this point, but had previously been Kriminal Kommissar (detective) in Berlin. He does look a little bit like the German counterpart of Hercule Poirot, doesn't he?
This is not the first time Carl Dunkel has had a doppelgänger. At one point, people he didn't know were greeting him on the street, but greeting him as someone else by a different name. Finally, he stopped one of these people and asked who they thought he was. I guess it must have been his natural instinct as a detective to track the other man down. He knocked on the man's door and when the door was opened, both men were purportedly astonished at how much they resembled one another. Carl Dunkel was born in 1871 and died in Würzburg in 1953.
There are no doppelgängers over at Sepia Saturday, but you might find some rabbits.