Four years after the tragic death of his brother Joe, Sonic Idols drummer Si Delaney still struggles to cope with what happened to the man whose shoes he subsequently filled. A forced hiatus from touring unleashes feelings he's tried hard to push aside, and Si knows he needs to seek forgiveness before he can ever truly move on. Determined to make amends he sets off in search of Joe's fiancée, Allie. Can Allie help Si to realise he wasn't to blame for the tragedy, or will he forever feel like an imposter in Joe's place?