The year is 1966. Ten years after her terrifying experience in Switzerland, Sister June is trying to live a quiet, uneventful life at the convent in England. When she discovers that Sister Margaret is dying, however, she begins to catch glimpses of a shocking secret from the convent's past.

Dark forces are reaching out to Sister Margaret in her final moments, and the ghostly figure of a missing woman stalks the convent's corridors. What really happened to Sister Rose when she disappeared many years ago, and why does her spirit seek revenge? The answers can be found deep beneath the convent, where an even deadlier secret waits for its chance to escape.