When you watch Hawaii Five-0 Season 5 Episode 16 online, an arsonist targets couples on Oahu, watching as they burn to death while trapped in their burning homes. When the Five-0 task force investigates the scene, they are joined by an ATF Agent from California, who's been hunting for this arsonist for years. The situation escalates when a second home is burned and more innocent victims die. It's clear that the arsonist is building towards some sort of dramatic endgame. Worse, the ATF agent is keeping secrets of her own, secrets that could put the team in grave danger. Meanwhile, Danny takes his girlfriend Amber to a romantic getaway, far away from the troubles of their everyday lives. What they don't know is that a mysterious man has come to the island in search of Amber, and it's not likely that his arrival is going to be good news for the happy couple. What is this man's reasons for finding Amber? Will the Five-0 task force and their ATF ally catch the serial arsonist before more people horribly die? Find out this and more when you watch Hawaii Five-0 Season 5 Episode 16 online at TV Fanatic!