A secret sect of the Vatican Church unearths a map detailing the locations of the four cornerstones of the Library of Alexandria; Flynn and the Librarians work with an unexpected ally to stop them before the stones can be used to destroy the Library.
Eve, Flynn and Jenkins go to a party hosted by Santa Claus. In the meantime, Santa's Sleigh is left in the care of The Library. It also happens to be All Thanksthieving Day, celebrated by thieves all the world over. Ezekiel feels he needs to see his family of thieves to bring his adoptive mother a gift which happens not to be stolen. Once Ezekiel's mother finds out that Ezekiel has been leading a double life at the Library one thing leads to another, as his mother steals the magical world globe to do her own thefts and what ensues has The Librarians try to right ...
When Flynn and Baird are sucked into Baird's favorite classic Film Noir movie, the Librarians are drawn into the world of movie magic - literally - where they'll need to perfect their lassoing skills, sharpshooting, and snappy dialogue if they're going to make it out alive.
A Librarian from the past teams up with the Librarians of the present to take down an ancient and powerful enemy let loose in the modern day. When superfan Flynn is met with the prospect of teaming with his Librarian hero Darrington Dare, he could not be more excited, until Darrington leaves the Librarians with this dire warning: There can be only one Librarian - ignore at your own peril.
When Baird goes after Nicole Noone in an attempt to repair her rift with the Library, she ends up joining Nicole in a mission to retrieve a dangerous artifact before it falls into the hands of Russian grave robbers. But can she convince Nicole to forgive the Library and return home with her? Or, will Nicole open Baird's eyes to the dangers of a Guardian dedicating herself, heart and soul, to the Library?
When dissension threatens the group, Baird takes the Librarians to a charismatic self-help guru's team building camp on the edge of a forest where people have been mysteriously disappearing. Is there a monster in the woods? Or is something more sinister going on? And can the Librarians get their team mojo back in time to defeat it?
After Cassandra freezes up during a mission, she decides it's past time to go on a vacation. Searching for her ideal town, she lands on Havenport, the "Safest Town in America." At first blush, it seems just what she needed, but is there always a price to pay for unrealistic peace of mind?
When Jenkins body-switches with a 28-year-old slacker named Jeff, he must find his way back into the Library to correct the mistake. But he will need a team to do it, and enlists the help of Jeff's hapless Dungeons and Dragons friends. Can they make it in time, before Jeff destroys the Library?
As tensions between the Librarians escalate over which of them is the most deserving to participate in the tethering ceremony with Baird, the Library steps in and turns each of the Librarians into their most primal selves, and are sent to survive a terrifying alternate reality to determine who is the most worthy.
After the world is morphed into a horrible and unrecognizable place - one where the Library never existed - it's up to Baird to bring the Librarians together before this bleak, knowledge-less world becomes the new reality.