When Dan's older sister Milly is hit by a car, she spends the last minutes of her life writing cryptic messages on her hands. Dan is devastated and distraught- and determined to learn why.
Six months after her sister's death, Alexandra Adams is trying her best to start a new life at Bradfield.
Her parents think it's a great way to help her move on, but the past isn't easy to forget...
Just when Alex thinks she's starting to fit in, she starts receiving messages from a blocked number.
It all starts with "I know what you did."
Will Alex get over her sister's death, or will she crack under the pressure of her lies and secrets at Bradfield?
Warning: this book contains scenes some people might find upsetting.