I am aware that the female detective may be regarded with even more aversion than her brother in profession. But still it cannot be disproved that if there is a demand for men detectives there must also be one for female detective police spies. Criminals are both masculine and feminine—indeed, my experience tells me that when a woman becomes a criminal she is far worse than the average of her male companions, and therefore it follows that the necessary detectives should be of both sexes.
And, yet, the writing doesn't read as stilted as I might have expected, either. I think I'm really going to like this.