Due North

"Due North" is the as-yet-unaired eleventh Season 4 episode of Shadow Unit, with production number 4x11. According to the initial announcement, it will be written by Leah Bobet, and is currently scheduled to air "at the end of February/beginning of March" of 2014. 

Pre-Air-Date Speculation
The air date was originally announced as June 3, 2013; on February 22, Emma Bull announced that the airdates for "Apolysis" and all subsequent episodes would be bumped one month into the future, which implied an air date of July 7. The delayed airing of "Dark Leader" further postponed "Due North". On January 20, 2014, Leah Bobet suggested that "Due North" would air sometime near the end of February or beginning of March, 2014, "In the name of getting us all back on a nice, healthy bimonthly routine". 

In a discussion about the "sequester" which caused the FBI to have to shut down its headquarters (the J. Edgar Hoover Building) for ten weekend days, Leah Bobet remarked:
 * ...holy crap. Due North just got reverse-prophetic.  o.o