Here are a couple unsolved mysteries you might find interesting.

the most eerie, yet interesting, unsolved cases/mysteries or deaths warning: all true stories. some may be unpleasant. - #2 in thrillers 6/8/19

The FBI team BAU has been searching for over two months for an unsub, who can for many murders of dead women with special vampire and sectarian tendencies. The case is almost at a lost, when suddenly the some mysterious informant calls with new information...