Here is a genuine and disturbing mystery.

Though the Justice Department promised yesterday to disclose how many of these have been released, other disturbing mysteries remain.

A university librarian, poet, and complicated man, he has left behind a trail of unresolved issues, a dysfunctional family, and a disturbing mystery.

On his visit home, Alex must confront another, more disturbing mystery: what's the matter with Nana Mama?

But they are stumped, and the case has become one of the most disturbing unsolved mysteries in the annals of medicine.

The Betazoid resolved to find the answer to this disturbing mystery even if she had to question every person who lived on the planet.

The matter about which I have come to consult you is one of disturbing mystery.

How he came to know-and to know more than we-is a disturbing mystery.

Soon she became known as a writer of ironic, disturbing psychological mysteries highlighted by stark, startling prose.

Just why Atlantic Beach has become the latest venue of a vicious bias attack is a disturbing mystery.