Shattered: Into the Cracked Surface

Isaac's older sister, Christine, has been missing for two months, and everyone believes that she ran away after an argument with her father. Isaac and his father blocked her room so that no "bad memories" come crawling in their home. But it was critical at school with people gossiping about her, but Isaac's two friends, Caleb and Thomas, help him get through it.
One day, Isaac sneaks into his sister's bedroom to recover her old stuff, seeing a cracked mirror with a missing piece and scratches on them. Before he knew it, he falls into the mirror, seeing glass, and Isaac couldn't imagine anyone living in such an endless, black hole. But when he hears Christine's voice, calling out to him, he figures that she isn't gone after all.