Looking for the title of a black & white film (I'd guess 40's or 50's) set in Europe that follows the travels of a mid-age woman (I think Aunt) and younger companion woman (niece). It is a comedic misadventure with people (criminals) out to get the women but the women unwittingly foil the crooks every attempt. I think there were some scenes at a castle, Transylvania looking setting. The young woman was probalby pretty and the mid-age woman was bookish looking, maybe a bit frumpy. My memory is vague so some of the details may be not quite right.