: Faced with an Internal Affairs investigation regarding his past, his integrity is once again put to the test. Major Plot Arcs and Themes
Critics and fans alike viewed Season 4 as a period of maturation. While some noted that the show occasionally "jumped the shark" with outlandish scenarios—such as the rescue mission in Afghanistan—the central "cargument" banter between McGarrett and Danno remained the series' emotional anchor. According to reviewers from TV Fanatic , the season successfully balanced serialized drama with procedural "case of the week" episodes, culminating in a high-stakes finale involving the kidnapping of Grover's daughter. Hawaii Five-0 - Season 4
The overarching narrative continues to grapple with the shadow of . A pivotal clue regarding "Shelbourne" leads Steve to suspect a blood connection, ultimately resulting in a DNA test to see if they are half-brothers. This arc emphasizes the show's recurring theme: the blurred line between family and enemy. : Faced with an Internal Affairs investigation regarding
The season also ventures into historical and social commentary. The episode "Ho'onani Makuakane" was particularly praised by reviewers on Rotten Tomatoes for its sensitive portrayal of a WWII internment camp on Oahu, proving the show could handle somber historical justice alongside its usual popcorn-flick energy. Critical Reception According to reviewers from TV Fanatic , the