The killer? Paradise's librarian, "Trent" (Ian Merrigan). His name isn't actually Trent, as we learn through the extensive flashback sequence from 12 years earlier that opens the finale.

Xavier's investigations bring him to Trent (Ian Merrigan), a librarian. This may come as a big surprise to viewers because he isn't featured in the series. But before the disaster, Trent was a ...

Viewers learn that Trent (Ian Merrigan), a former project manager for the bunker, killed him with a rotary drill bit after sneaking into the city and posing as a librarian named Eli. Trent's ...

Xavier's investigations bring him to Trent (Ian Merrigan), a librarian. This may come as a big surprise to viewers because he isn't featured in the series. But before the disaster, Trent was a project ...