Looking along the street, the cabby could see no sign of his mysterious passenger.

A mysterious passenger stepped into another cab that was parked close by.

He had finally found himself alone; the mysterious passenger had dropped off somewhere.

A soft laugh came from the fixed lips of the mysterious passenger.

No wonder their mysterious passenger was unwilling to name a destination.

To prevent such a happening, he obeyed the command of his mysterious passenger.

When and where had this mysterious passenger entered the cab?

He didn't want traffic cops looking in through the windows and noting the mysterious passenger.

And so had some of the mysterious passengers been out of things for a long time.

Those transporters could also be used to bring aboard their mysterious passengers from the past.