Things change, from when you were young. Once, Delilah Cook lived in Sydney, was best friends with a boy called Luke Hemmings, and had big dreams of being a singer. Then the terrible, tragic and unexpected happened. Now, Delilah lives in Melbourne, is recently signed music artist, has a best friend named Emilia Jones and doesn’t think about Luke anymore. At least, that’s what she tells herself. But when Delilah finds herself on a tour with the 5SOS boys of her past, what could possibly go wrong?

What would you think if you received letters from someone and it seemed they could never be caught? This just so happens to be Delilah's problem right now. The police have been able to do nothing to help her until they suggest that she be sent away to Bentwood Institute for Boys to go into hiding. But being the only girl in an all-boys school for delinquents isn't exactly as good as it sounds. After entering the school, she finds herself being stalked again. But as she looks for answers, secrets start to unravel.