According to the Hollywood Reporter, Rose will play FBI Agent Jessica Foster. One of Mike's (Aaron Tveit) superiors at his job in Washington, Jessica is described as someone who seems like the consummate bureaucrat but who tends to bend the rules when necessary.
Considering the trouble people get into at Graceland, this is likely to be a very handy skill.
Two other roles -- one recurring and one to guest-star -- have also been cast for Season 2. Brianna Brown ("General Hospital") will recur as Kelly Badillo, the wife of murdered Juan Badillo (Mike's former handler, killed by Briggs in Season 1). Benito Martinez ("The Shield") will also appear in the new season, guest starring as Alfredo Armas, the head of the nefarious Caza Cartel.
"Graceland" will return for Season 2 in Summer 2014. "Haven" will air the first half of its extended Season 5 in Fall 2014.