Provider: Eastern (ET) Change
Part 1 of 2. Castle and Beckett encounter an old rival, Dr. Kelly Nieman, while looking at clues in a woman's mysterious murder. As they investigate the case further, links emerge between the crime and an infamous serial killer.
An ambitious detective from Hong Kong joins forces with Castle and Beckett because she has info on a murder victim discovered in a park. However, Beckett soon learns that there may be secrets about this detective and the victim.
A security-detail assignment goes badly for Ryan when shots are fired at a politician during a charity event. A determined Ryan then sets out to catch the shooter, and Castle and Beckett assist him as he retraces what happened.