This woman has been murdered! I am a witty private detective that doesn't really fit in to society. But I will solve this urban mystery because I am smart and better than everyone else.
This woman has been murdered! I am young and have no detective skills whatsoever, but I am going to solve this mystery! Often times, the protagonist is a female, too.
This woman has been murdered! I am investigating a murder that takes place in a historical setting. I will solve this mystery using the tools available to me, and I will make the story come to life in the eyes of the reader.
I'm a normal teenager but am in a scary situation. My story's plot is sometimes considered romantic. I know who the villain is and am trying to deal with the results of his actions. I need to stop him before it's too late.
This woman has been murdered! I am from the future and have been sent back in time to solve this mystery. This makes my story a blend of mystery and science fiction.