S4, E15: The Justice Department has new witnesses who are willing to testify against Eli, but refuses to reveal who they are. When she discovers that Frank Landau is one of them, Elsbeth decides to take him to civil court for defamation so that she can force him to answer her questions under oath, which annoys Assistant US Attorney Josh Perrotti. Meanwhile, Peter prepares for a debate with Maddie Hayward.