Class killer (Part 1)

THIS IS MY FIRST BOOK I'VE WRITTEN, BUT IT'S COMPLETELY CORRECT. PLEASE WRITE COMMENTS BECAUSE I REALLY NEED THEM.
When a new student arrives in their tenth grade class, everyone is eagerly awaiting his arrival, but he unexpectedly becomes the victim of a murder. Just before a party in his honor, he is murdered, and classmates Caroline Myers, Sam Manel, Catherine Tremben, and Sim Krindel are forced to face a shocking reality: there may be a killer in their class.

Although the new student has barely managed to fit into their lives, his past, full of bullying and intrigue, is revealed after the murder. Each of the classmates has their own secrets, and trust in each other quickly melts. Caroline, smart and brave, takes the initiative to find out the truth, but Sam, famous for his sharp mind, and Katerina, constantly analyzing situations, do not always agree on decisions.

Meanwhile, Sim, often considered the class joker, is hiding more than just jokes. Will they be able to find out who is really behind this terrible crime, or will they be left lost between friendship and trust?

"Class Killer" is a tense detective story about secrets, betrayals and the fight against bullying, which will make not only the heroes, but also the readers, think about who is really a good friend and who can become a danger.