Jacqueline Torres

An FBI agent takes over the case when a two-year-old girl is kidnapped and a hefty ransom demand made. Despite instructions from Beckett to stay away from the investigation, Castle gets involved when he finds out that the FBI agent is her ex-boyfriend.

A boy disappears after meeting up with an online gamer; Benson suspects her son is being bullied.

Elizabeth goes away on a retreat and her staff try to contain an outbreak of measles while securing an international agreement.

When the eruption of an Icelandic volcano strands Elizabeth at an airport in Ireland with the Turkish foreign minister, she tries to broker a deal with him to save the lives of thousands of Syrian refugees. Henry gives Alison advice.

Sipowicz reports for the sergeant's exam and finds he is the oldest taker of the test. The detectives are on the scene of a death of the brother of a mentally disabled man.