Provider: Eastern (ET) Change
Castle's thrown into an alternate universe during a murder investigation, and Beckett, Esposito and Ryan view him as a stranger in this world, so he must persuade them to let him assist them. Afterward, Castle finds the experience very inspiring.
A suspicious wife hires Castle to see if her husband is being unfaithful, and the case turns deadly when Castle witnesses his client get killed. Beckett and Castle then investigate the homicide, however, they have no real evidence of the murder.
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.
A personal-injury lawyer with a big personality is murdered, and the list of suspects is long, full of both clients and competitors. However, as Castle and Beckett investigate the case, they unearth a surprising secret that may be connected to the crime.