Grover's parents and brother arrive in Oahu for Thanksgiving; a thief is crushed to death by an empty safe
Hawaii Five-0 episode guide
McGarrett investigates a cold case that his grandfather and the famous Honolulu detective Chang Apana worked on in the 1940s; McGarrett and Danny get ready for the opening of their restaurant.
McGarrett crosses the line and is arrested while investigating the death of his former SEAL buddy, who died while making an emergency landing on an aircraft carrier; Adam returns to Oahu with devastating news about his marriage.
Mac and Jack rush to Mexico to help capture the leader of a drug cartel while the country celebrates Dia de Muertos.
Mimiki Ke Kai, Ahuwale Ka Papa Leho (When The Sea Draws Out the Tidal Wave, the Rocks Where the Cowries Hide are Exposed
A heat wave hits Oahu, contributing to a spike in crime; McGarrett and Danny hunt down a bank thief; Tani and Junior's car is stolen while they're on duty; Kamekona incites a riot by price-gouging his ice.
Detectives Steve McGarrett and Danno work on an elite task force whose mission is to eliminate crime on the beaches of the Aloha State.
After McGarrett's CIA agent friend is killed, he lets himself be captured by the group he thinks is responsible to find the killer; Tani questions whether she should tell McGarrett about the murder weapon she found at Adam's house.