Don't judge a book by it's cover

Rebecca Blackstone is no ordinary 15 year old girl. She's a spy. It all started when her parents were killed in a supposed 'accident'. She believed it. She was 6 at the time. She believed it until 2 agents from military intelligence section 6 or better known as MI6 told her the truth. She then made it her life's mission to save lives. She's just been sent on a mission to protect high school bad boy.... She can do many things but she can't stop herself from falling in love....