Question: Generate a question that has the following answer: Franz for the following movie plot: The film begins with a Brownie troop visiting a doll manufacturing company called Dolls Inc., owned and operated by the seemingly kindly Mr. Franz (John Hoyt). As the girls tour the factory, they see a number of very lifelike dolls stored in glass canisters locked in a display case on the wall. These are part of Mr. Franz's special collection. Sally Reynolds (June Kenney) answers a newspaper advertisement for a secretary; Franz's previous one has mysteriously vanished. Although she is concerned about his obsession with his dolls, she reluctantly agrees to take the job. She soon meets a traveling salesman, Bob Westley (John Agar), who introduces himself as the best salesman in St. Louis and immediately sets about attempting to seduce her. Their relationship become serious enough that Bob persuades Sally to quit her job, promising to break the news to Franz. The next day however, Franz informs Sally that Bob has gone back home to take care of business and that she should forget him. She, however, is unwilling to accept this and goes to the police with a theory about Franz' role in her boyfriend's disappearance ("He made Bob into a doll!"), but Sergeant Paterson (Jack Kosslyn) is skeptical. Franz has developed a machine which can shrink people down to a sixth of their original size. He then uses it on anyone who tries to leave him. When he finds that Sally plans to quit, she becomes his latest victim. Franz has already miniaturized at least four other "friends". They are stored in suspended animation (which he has also invented) in glass jars in a display case in his office. After a reunion between Sally and Bob, Franz reveals how the process works and why he miniaturizes people (it seems that he developed a strong phobia against being alone after his wife left him). Periodically, Franz awakens his captives to enjoy parties he throws for them. During a welcoming party for the two newcomers, Franz has to deal with full-size friend and customer Emil (Michael Mark). The prisoners try, but fail to call for help....
Answer:
Who does Sergeant Paterson investigate?