S1, E1: On a mission to retrieve a WMD, NATO counter-terrorism expert Colonel Eve Baird crosses paths with occult expert Flynn Carsen, who's on his own hunt for a lost demonic artifact. After a furious battle of gunfire and magic, Baird finds herself drawn to the mysterious man who claims to be simply "a Librarian". Baird is soon invited to join the ancient organization known only as "the Library", based in an endless Library of artifacts hidden deep underneath New York City. Now teamed with Flynn - who's half-mad from a decade of world-spanning magical adventures - Baird finds herself embroiled in the ancient battle between the Library and the Serpent Society. The Society are occultists who wish to bring magic back and use it to rule the world, led by the mysterious Dulaque. Soon Flynn and Baird are in a race against time to save the lives of other extraordinary people the Serpent Society has targeted for assassination: synesthete science genius Cassandra Cillian, rough-living art and history expert Jacob Stone, and infamous high-tech thief Ezekiel Jones. These three reveal a deeper conspiracy, a plan by the Serpent Society to hunt down the key to controlling all magic - the ancient Crown of Camelot's King Arthur.