Castle and Beckett investigate the murder of a Wall Street trader, but the case takes a shocking turn when the they discover the victim was an undercover informant for the U.S. Attorney's office. To complicate matters further, the U.S. attorney involved is Elizabeth Weston, Captain Gates' estranged sister.
Elenco: Nathan Fillion , Stana Katic , Susan Sullivan , Seamus Dever , Jon Huertas , Molly C. Quinn , Tamala Jones , Toks Olagundoye , Seamus Dever , Susan Sullivan , Tamala Jones .