Kirk finally understood the ultimate mystery that had united them.

Sergeant White described missing-persons cases as "the ultimate mystery of detective work, where each one is different."

Flynn has also described marriage as "the ultimate mystery."

Although why that should be so is the ultimate humbling mystery.

It's the ultimate mystery, because we never really see it close up.

Others, however, never quite managed to take this step but assumed that their conception of God was identical with the ultimate mystery.

Science may not be able to solve the ultimate mystery of life and death, but it can certainly clarify some aspects of the issue.

More than a year after the world first heard of her, Lewinsky has solved the scandal's ultimate mystery.

Why that proved to be the case is the ultimate mystery Taylor poses, and as with the others offers no easy solution.