Teen Killers Club by Lily Sparks
After being framed for the murder of her best friend, teenager Signal Deere is sent to secret program for eighteen-and-under Class A criminals where she'll train to become an assassin. She plans to track down the real killer and clear her name, but she never expected the mysterious man in the woods that is determined to pick them off one by one. She and her new friends must hurry to uncover the truth before one of them is next.
Review from Booklist:
After being accused of killing her best friend, Signal Deere is offered an opportunity to exchange years in prison for a mysterious training program alongside other teens who have been designated “Class A.” Upon arrival, Signal realizes that this “Teen Killers Club” is made up of exactly that: teens who have committed murder and were recruited to work as assassins in exchange for their freedom—if they survive the program, that is. As Signal gets to know her fellow campers, she forms friendships and mixed feelings and delves into what happened the night her best friend was murdered, as her memories slowly return. Readers will be on the edges of their seats as they read this fast-paced thriller full of characters with hazy backgrounds and unclear intentions. The Suicide Squad–like premise evolves into a complex mystery, with the characters revealing more of themselves as the novel progresses. A note of caution: included here are depictions of extreme violence. A fast-paced, suspenseful novel, perfect for true-crime fans.