You've Changed Things, Forever

Jack Napier and Rain Hammond have been best friends since they were kids, and have been there for each other trough everything...so how does Jack react when Rain leaves with her family to California? Wil Rain recover from losing her best friend and the love of her life? and what happens when years later Rain has a run in with the infamous joker?

I suck at descriptions just give it a shot, it's better than the info. sounds.