Something is tapping in the office after midnight.

Lena Carter works the night shift entering visitor logs for a research facility that should be completely empty. But tonight, the system begins recording entries no one made… and visitors no security camera can see.

As the log fills with impossible records and the quiet office begins to answer her heartbeat with three slow knocks, Lena realizes the system may not be malfunctioning.

It may be documenting something that has already arrived.

And it knows exactly where she is.