The worst of it, though, was that he could not protect her from this unseen threat.

A second glance showed the mother's face to be more anxious than angry, irritated by some unseen threat.

The unseen threat hung over Peter's entire life like a death sentence.

They were all too aware that scheduling arrangements didn't matter much against an unseen threat ready to get you on any shift, at any time.

The stress of unseen threat altered established patterns in Moonless's routine.

After a while I began to feel lucky to be out of the house, where so many unseen threats apparently lurk.

He acts as a watchman for the people of Whitechapel, protecting them from an unseen threat.

The dog leapt to its feet, teeth bared, looking all around for the unseen threat.

There was a threat, unidentified and unseen, somewhere at Caithness.

Yet he couldn't shake the uneasy feeling that an unseen threat lurked in the shadows.