Detective Benson's half-brother Simon Marsden turns up in New York after a five year absence, and asks for help - Child Services is threatening to take his children away from him. She asks defense attorney Bayard Ellis to represent her brother, but the seemingly simple case turns into a disaster for Ellis and his client. Meanwhile, a homeless couple finds a newborn baby abandoned near a hospital, and Detectives Fin and Rollins follow the evidence to a shocking discovery.