Ep 5. Kupu'eu (Fallen Hero)

In Hawaii Five-0 season 4 episode 5, titled "Kupu'eu (Fallen Hero)," the Five-0 team investigates the murder of a former Navy SEAL who was working as a security guard at a construction site. The investigation quickly leads them to a group of thieves who have been targeting construction sites, stealing copper wiring and anything else they can get their hands on.

As they dig deeper, the team uncovers a much bigger plot involving a wealthy businessman who is using a private security firm to carry out illegal activities. The businessman, played by guest star Tom Berenger, is not only behind the thefts at the construction sites but also has ties to the drug trade.

Meanwhile, McGarrett (Alex O'Loughlin) and Catherine (Michelle Borth) continue to navigate their complicated relationship. Catherine, who is in the Navy Reserves, is called up for active duty and must leave Hawaii, leaving McGarrett unsure of where their relationship stands.

Chin Ho (Daniel Dae Kim) also deals with personal issues in this episode as he is tasked with looking after his troubled teenage niece Sara (Londyn Silzer). He tries to connect with her and help her through her trauma, but their relationship is strained as Sara struggles to come to terms with her mother's death.

In typical Hawaii Five-0 fashion, "Kupu'eu (Fallen Hero)" features plenty of action-packed scenes, including a thrilling car chase and a tense confrontation between the Five-0 team and the main suspects. The episode also tugs at the heartstrings with its exploration of personal relationships and past traumas.

Overall, "Kupu'eu (Fallen Hero)" is a solid episode of Hawaii Five-0 that offers a good mix of action and drama while further developing the show's main characters.