When does Warehouse 13 return?

U.S. Secret Service agents Myka Bering (Joanne Kelly) and Pete Lattimer (Eddie McClintock) are assigned to the secretive Warehouse 13 for supernatural artifacts. The program follows a team of field agents who retrieve artifacts that have become charged with energy that can give them dangerous powers if misused. Warehouse 13 is the latest in a line of storehouses with infinite capacity that have served this purpose for millennia. The series posits that there have been a dozen incarnations of the warehouse before the present-day 13th in South Dakota.