Anna and her 8-year-old son flee to a hidden apartment in a massive building, terrified her ex-husband will track them down. To ensure their safety, Anna purchases a baby monitor, but eerie sounds emanating from the device lead her to believe another child is being brutally murdered, potentially her own.

The Monitor
A mysterious frequency detected on a family's baby monitor starts to disrupt Anna's sense of security, forcing her to confront a dark secret from her past.