Ellie was the prime suspect until the investigation turned to her own brother, Caleb.

The resulting investigation has had many twists and turns, not the least of which is that some people think this really happened.

At least, I hoped the investigation was turning in that direction.

But those investigations will inevitably turn to questions of how Parmalat operated.

A new investigation has turned up a suspected United States spy operation.

His investigations turned instead to finding variations on the cosmo theme.

No suspects had been identified, and after a time the investigation turned cold.

McFarlane said the investigation could turn into a murder inquiry.

The investigation hasn't turned up much of anything yet.

The four-year investigation has turned the well-established auction world upside down.