Pastor Schönhoff
Sophie
Rudolf
Charolotte
Fritz Merkelbach
Alex Winkler
Georg Schröder
Klärchen
Engineer Frank
Trude
Bornschläger
Master tailor Stenglein
The title alludes to the popular 1925 song I Lost My Heart in Heidelberg composed by Fred Raymond with lyrics by Fritz Löhner-Beda and Ernst Neubach. The film taps into the nostalgic reputation of Old Heidelberg.