S15, E14: Tom Moore (guest star John Benjamin Hickey) arrives home from a business trip to find his young son, Nicky (guest star Duncan Nicholson), missing from his bed. With a history of behavioral problems, the cops suspect he wandered off alone, and the search becomes more urgent as the diabetic boy's insulin pump runs out. But the investigation leads to something more dangerous when a criminal couple (guest stars Rosanna Arquette and Mark Boone Junior), known for child endangerment and pornography, is spotted with Nicky. With a child's life on the line, the cops try to turn one suspect against the other before it’s too late. Meanwhile, a personal issue derails Sergeant Benson's (Mariska Hargitay) current course.