Possible Clues:

• There's no magistrate in a lab - and nothing usual about that
• Deviant or unnatural
• No alarm bell initially activated, which is very strange
• A key opera, length unusual
• Not typical or usual
• It's not usual to get a girl in a lab like this
• Deviant, different from the usual
• Different to what is ordinary or expected
• Freakish
• It's not the usual thing to have a girl in the lab (8)