Rebecca Romijn

An ancient organization hidden beneath the Metropolitan Public Library, dedicated to protecting an unknowing world from the magical reality hidden all around, solves mysteries, fights supernatural threats, and recovers powerful artifacts.

The Librarians embark once again to save the world but this season their greatest challenge will come from within the Library itself.

A war is brewing between those with special powers ("mutants") and the rest of humanity -- and the only ones who can save the humans from certain destruction are a special group of mutants- the "X-Men."