There was a researcher that was searching for different publications of an old book. The book had a star on the front cover. In different publications there were slight differences in pictures that were seen by magnifier.
Researcher meets with thepeople who has this books and after he meets these people were killed.

The Ninth Gate: The Ninth Gate (1999) - IMDb (http://www.imdb.com/title/tt0142688/)

Can you believe it was on this am? I was just going to answer your question but cat1864 beat me to it. What do you call this? Serendipity?