Instead of being a missing assistant, the man had become an unseen killer.

The unseen killer was some part of the base crew, that was for sure.

Soon, an unseen killer begins to murder the mansions' staff with a table leg.

And without question, there were unseen killers in the crowds outside.

A single mother strives to protect her children from a stalking, unseen killer.

The film begins when a girl is murdered by an unseen killer.

Kim's unseen killer had not lingered to steal a thing.

He stood up and turned to pursue the unseen killer.

However, an unseen killer shoots Buckley, making him the fourth recent murder victim.

They could have been left open and locked only after the unseen killer had gone into the building.