This novel is about a girl wondering and trying to solve the murder case and find a serial killer who have return after 6 years leaving her stunned and the girl finds the clues to seek the killer and kill him herself as the case was kind of personal to her. The serial kill always leaves a small flower as a warning before killing someone and no investigation team could ever find it but the girl was very clever and discovered it 6 years ago when she was only 10. The sign was a flower called Black Petunia which refers to a sign of death. It was personal to the girl because her best friend just to try and same her, was killed by the serial killer. The girl and her friends were desperate to find the killer and kill him.