IT seemed incredible that an unknown intruder could have entered here and made away with those notations.

Our unknown intruder has retrieved the Earth's position from the data bank!

The hunt for the unknown intruder had begun to fascinate him.

Despite his heavy build, this unknown intruder was smooth of action.

But in the case of an unknown intruder, Kemfort must be quite at loss.

And Larry was thinking of an unknown intruder, even if Kemfort wasn't.

Her body felt like an unknown intruder, pressed close against her back.

Safe - in a way - except for the fact that the unknown intruder was coming rapidly up the stairs.

As it turns out, his problem is not an unknown intruder, but the daughter's fiance, who is going to marry her in the morning.

It never occurred to Gale that she might be making a grave mistake, telling all this to an unknown intruder.