Horatio suspects a sniper is responsible when three people are shot during rush hour. But the team are puzzled when the evidence on a fourth victim doesn't match up.
When a small plane crashes on a beach and the pilot dies, it seems that the aircraft may have been sabotaged, with suspicions turning towards the victim's neighbours.
A cop is murdered in unexplained circumstances and Horatio becomes suspicious when Internal Affairs get involved, leading him to believe that this wasn't a random crime.
Horatio and the team investigate lifestyles of the rich and famous when a nanny working for a wealthy family is found dead after being stabbed and poisoned.