1.   Police are still trying to unravel the mystery of how the prisoner managed to escape.

2.   Scientists continue to unravel the mysteries of human genes.

3.   We are only just beginning to unravel the mysteries of the human brain.

4.   When scientists attempt to unravel the mysteries of the past they always run up against a brick wall.

5.   Detectives are still trying to unravel the mystery surrounding his death.

6.   She had been working on them ever since she had got home, reading and re-reading the articles, but there was still no clue to unravel the mystery.

7.   A prepared statement failed to unravel the mystery.

8.   A new video aimed at unravelling the mysteries of the British Parliamentary system has just been released.

9.   An ambitious young man with an eye for royals, as his attorney, Dan Williams, told the jury, he set out to unravel the mystery.

10.   And Myst, a CD-ROM adventure game that challenges users to explore and unravel the mysteries of a surrealistic island, has been an unqualified hit.