"If this inside dope from mysterious sources is correct," I said.

The parking lot had slicked up, reflecting light from mysterious sources.

Or had he been taken on to the mysterious source of power?

The mysterious source of heat would soon be just below him.

And a mysterious, unidentifiable source of radiation on the planet.

If you've received aid from some mysterious source and think you're going to get it again, so much the better.

All at once, water could be seen, glistening as it rose from some mysterious source far underground.

A great deal of the calls Smith has been receiving lately originate from mysterious sources.

Soon after that incident my brother and I were sent away to school - our tuition money borrowed from some mysterious source.

"Therefore, our mysterious radiating source must also be getting more power."