19. The Greater Good

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.

Plot summary and ending

Spoilers ahead. Coverage follows the scope labeled below.

Complete story — includes the ending

A 9-1-1 call leads the team to a Wall Street broker's body. The caller works for the U.S. Attorney 's office, alongside Gates' sister Elizabeth ( Salli Richardson ). The victim was their insider, investigating his boss. He made a $25 million wire transfer, given to him by his boss, and planned to take the money home to Venezuela. However, Elizabeth's partner believed the brokerage still needed investigating and killed him for "the greater good".

Sources and content license

Source and revision history · Adapted from Wikipedia contributors, Castle season 6. HTML formatting and reference markers removed. · Content license