Complete story — includes the ending
Beckett and the mystery caller, a hacker named Vikram Singh ( Sunkrish Bala ), fend off the killers before a CIA agent named Rita ( Ann Cusack ), the wife of Jackson Hunt and Castle's stepmother, intervenes. Beckett and Singh start piecing the puzzle together: Singh encountered a project called LokSat and forwarded it on to McCord and her team, setting events in motion. When McCord was killed, he contacted Beckett. Rita supplements this with her own investigation into LokSat, revealing that Bracken had a partner who used CIA assets to smuggle drugs into the country during the events of "In the Belly of the Beast", and using the proceeds to bankroll Bracken's presidential campaign. Bracken is killed in prison by his partner Loksat and his team. Reuniting with Castle and her team, Beckett realizes that the conspiracy has not been brought to heel and that the Attorney General is a part of it. However, Bracken's partner remains at large, and his prediction that Beckett will be consumed by her obsession comes true when she leaves Castle.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Castle season 8. HTML formatting and reference markers removed. · Content license