Silhouettes - An Owl City/Adam Young fanfiction

It appeared to be normal mirror. But looks can be deceiving, as Adam soon finds out. It turns out the mirror had once been a portal that broke over time. Yet, it still had enough power to drag Adam into an alternate universe, where Adam meets an alternate version of himself named Echo. At first everything in Echo's universe appears to be normal. But when people and objects disappear out of nowhere, it's up to Adam and Echo to put a find out what is really going on, and put a stop to it.