As she had feared, his mystery caller had phoned back, this time with information.

The mystery caller from Edinburgh was from a news agency.

A few minutes later, the mystery caller offered hard proof, and directed Eggy to visit his Web site.

My main concern was whether they served food, closely followed by wondering what my mystery caller had for me.

Another mystery caller asked her to phone him at an Edinburgh number.

From there Winder could watch for the car that would bring the mystery caller to this meeting.

"We can search, and nobody - especially our mystery caller - will know we're looking."

I worked on my mystery caller first.

"Just shut up and listen," it said, the mystery caller's breath crackling electronically as he paused.

The thirty officers working on the case urgently want to trace the mystery caller.