Indeed, frau Ilsy's power was not confined to the doctor's household.
"Bracebridge Hall, or The Humorists"
Washington Irving
frau Reitschel has learnt of them, but she is eager to come before you and take oath of entire secrecy."
"The Secrets of Potsdam"
William Le Queux
That spy was frau Kleist's son.
"The Secrets of Potsdam"
William Le Queux