Pembleton's first case as primary since his stroke is to find the person who murdered District Attorney Danvers' fiancée while she was trying on her wedding dress.
A double homicide involving two journalists investigating a story about gold fraud occurs the day before St. Patrick's Day; a woman (Mädchen Amick) draws Mac's interest.
The investigators probe what appears to be gang-related gunplay in a hospital emergency room, then discover a cheating girlfriend may be the catalyst for the shooting.
Horatio and the team look for a killer wanted for the murder of a police officer during a traffic stop, but their only lead is an eyewitness report from a suspicious teenage girl.
The murder of a bellboy during tourist season leaves detectives with many suspects, but the luggage he had been loading helps them to uncover a complex counterfeiting operation.
The team travels to a North Carolina town where one woman was found badly injured and another is missing, and discovers those may not be the only victims.
The team investigates when bodies are found buried beneath the ocean floor off Florida; Morgan is rattled when his aunt thinks her missing daughter is one of the victims.