Dust and Shades of Grey

After a years absence, Wil Francis returns, but something isn't quite right. His appearance and personality have completely changed. Of course his old best friend, Rhianne McMillan, realises and refuses to drop the matter.
However, as Rhianne delves further into her friends mysterious disappearance, she uncovers the life threatening truth.

EDIT: Yup, I renamed it. I was never really happy with that title anyway. The new name is a lyric from The Sky is Falling by the lovely Aiden (of course, it's an Aiden story, duh.)