The Gateway (2015)

When Danni, a burnt-out former hospice nurse, moves into a new apartment, she thinks she's finally found the key to a simple, less traumatic life. But when things start to disappear through a strange portal in her bathroom wall, Danni realizes she's discovered a gateway to the unknown that brings unimaginable horrors to this quiet apartment. Along with her co-worker Tim, Danni begins an investigation that leads to an unforgettable conclusion.