When does Legends return?

The series is based on the 2005 book Legends: A Novel of Dissimulation written by Robert Littell. Sean Bean is an undercover FBI agent who changes himself into a different person for each case. The score of season 2 concludes with "Until We Go Down" by Ruelle, played during the climax of "The Legend of Alexei Volkov"
Martin Odum (Bean) is an undercover FBI agent who changes himself into a different person for each case. A "mysterious stranger" (played by Billy Brown) causes him to question his sanity.