Murder of Jacob Howard

Ella is just a normal girl in a normal high school in a normal town. She has a hardworking mom and dad, is popular, is in almost every club in her school, and she has good grades. Well, there is just one thing, her uncle was brutally murdered the year after she was born. He was a police officer named Jacob Howard, and no one could find out who murdered him.
When Ella's friends start to go missing after they plan to do an English assignment on her uncle's murder, she starts to suspect the murderer is targeting her and her friends. Her point is proven when the first friend to go missing is found in an abandoned farm, dead. Found next to her is a not with all of her friend's names in a mysterious order, each given a time and date. Ella's is the only one in red.
After that note is found Ella's locker that tells her she needs to find who the killer is before her time, or else she will watch all of her friends die, and then herself.
Will Ella be able to solve the murder in time? Or will she watch as her friends get brutally murdered and then her?