Their film is never completed due to sinister forces in the building.

The very phrase makes these moms sound almost like a sinister force.

A sinister force is at work in a small Maine town.

"You can be sure some kind of sinister force is at work here."

Only one man dares to take on the sinister forces of the Master.

If profits fall, these sinister forces have the most to lose.

Rather, a victory that should have been his was snatched from him by sinister forces.

Might a fox spirit, or some equally sinister force, have led her off?

And Nature drew upon her sinister forces to add to the fear which the youth already felt.

And more sinister forces have been at work as well.