Michael Countryman

Sherlock and Watson investigate a child abduction case involving a serial killer known as "The Balloon Man."

A crucial agent crumbles under emotional distress and threatens to topple a valuable network of KGB informants. Professionally, Philip and Elizabeth are tasked with infiltrating the FBI's new communications encryption system while personally they are forced to grapple with one of the darker aspects of life as a spy.

A 5-year-old girl is abducted after her father leaves her in the park with strangers; a teen is dragged by a car; Sipowicz intervenes when McDowell's sister suffers abuse at the hands of her husband.