A year after the murder of her sister Zoë, Echo is determined to uncover the truth. With Zoë's diary as her guide, Echo finds herself pulled into the darkness of her sister's secret life and she uncovers how one small decision can lead to tragic consequences.
| Actor | Role |
|---|---|
 Laura MaranoEcho | Echo |
 Vanessa MaranoZoë | Zoë |
 Chris TavarezMarc | Marc |
 Giorgia WhighamCarley | Carley |
 Nathaniel BuzolicJason | Jason |
 Evan CastelloeTom | Tom |
 Michael ProvostParker | Parker |
 Annie JacobAbby | Abby |
 Ken JeongDr. Gallagher | Dr. Gallagher |
 Whitney GoinZoe and Echo's mom | Zoe and Echo's mom |
 Jason DavisZoe and Echo's Dad | Zoe and Echo's Dad |
 Ahmed LucanFirst Detective | First Detective |
| CCameron HuntVideogame Boy | Videogame Boy |
 London SummersTheresa | Theresa |