Steve is not amused that his irresponsible niece surprises him with a girl to babysit, but she already completed adopting it, so he, China and Danny takes turns braving infantile secretions in the field or the precinct. A murder victim, stabbed while surfing, left Chin's class at the police academy on a drug relapse to the gutter, but Special Agent Blake Kennedy now reveals he was a top-notch ATF informer. The team uncovers a crafty system of contraband arms trade involving his lover-handler and her partner profiting from gang rivalry. Meanwhile Catherine completes the Yakuza research for Chin and follow with an undercover in the casino, successful enough for Steve to invite her to join Five-O, while haughty SWAT captain Lou Grover is told to take 'mere military' Steve's orders or butt out altogether.
—KGF Vissers