Hi, I need unbiased input ;-) I have a novel which has a main plot revolving around a very problematic ("forbidden love") romance. One of the MCs works with the police. The other MC is a witness to an ongoing series of crimes (though she learns only mid-novel that she is a witness). I have one sub-plot which deals with one of the problems the two forbidden lovers face, that one is just fine. BUT - I also have the much more important sub-plot which deals with the crime the male character is solving in his day-job. And I am not really into whodunnits. I like reading them, but I never though of myself as someone capable of creating riddles. This one just happened beause the police job fit the male character. So, there is a serial rapist at large in that fairly big town who also kills his victims when he discovers they have looked at him (and could describe him). He kills quickly, the rapes are executed in a horrid mannerand have the whole police force enraged and up in arms to find him fast. The male character's (forbidden) girlfriend unwittingly witnesses one of these rape cases and the rapist will learn about her being able to not just describe him, but also to stand witness in court against him. The climax of the novel is first the consumption of their relationship and resolve to stay together, and then the rapist will set out to kill the female MC. They'll be barely able to rescue her. So far so good, the problem is that a) this has been done quite often in a variety of stories, so would the readers dislike such a plotline for being too common? And b) I can think of no twists or red herrings I can weave in. Do I really need them? Does it have to be someone they all know (except for her)? Can it be a total stranger? Would that shave off too much suspense? What are your thoughts and ideas?