Castle goes undercover at an elementary school to find the second-grader who may possess information about the shooting of an ice cream vendor.
With the evidence piling up, Jane tries to both protect Maura and investigate when Maura's date turns up dead and Maura can't remember anything about their evening together.
The detectives investigate the murder of two psychiatrists who were also husband and wife. A medical examiner attending a seminar offers to help Jane and Maura. A pregnant stranger may have something in common with the Rizzoli family.moreless