Its about this girl who's brother died and everyone thinks it was an accident, but she thinks its murder. That convinces her to become a teen detective with her best friend, who she harbours a slight crush on, like every girl in her grade. When two girls her age show up dead, and the murderer is believed to be a classmate at the school, she is sent to the new school to pick out the wrong-doer. Between a budding romance with him, a temporary new school and trying to keep her parents together on top of trying to find evidence that her brother was murdered, she has her plate full.
I made up half that while writing it. Wow.
Anyway that catch to her is that she has dyslexia, so she struggles with school but has better observation skills than most other people. Its hindrance and a blessing all in one.