Who Killed me?

"As I turned, I saw beside me laid a man in his thirties, blood pouring out from the wound in his stomach. I was bewildered, where was I? Who is that man beside me? Why do I have this knife with me? These questions fogged my mind.
I was feeling dizzy and was disgusted by the sight of blood when memories of what had transpired here started pouring into my mind. But it was not me, they were not my memories, I have not seen this man in the entirety of my twenty years of life...nor do I know the person whose memories were flooding my mind. Who is it? "
Enika is a simple college student, she was caught in a car accident and went into a coma. Meanwhile, her soul wandered off and transported to a novel on her bookshelf, one she had not read. She knows nothing of the novel, but with the help of a messenger, she gets to know that the novel she is in is a Murder Mystery and she has possessed the body of the dead sister, Evelyn Gracia of the male lead, Alexander Gracia.
The only way she could go back to her home is by finding the killer, and by killing him.
This is her story where she tries to find the killer before he finds her, with the help of her knight, Edmund Florentine and the crown prince, Cesare Samarian.