On Halloween, Danny can't resist playing another mean prank on his forensic cousin Eric Russo when Five-O is called to examine the death from sheer fright of the inhabitant of the island-wide renowned haunted house. It's retired medium and paranormal author Marjorie, whose PA swears she also noticed spooky events, even alone. The team finds special effects and possible motives abounding with tricked clients and illusionist Nathan Betts, who swore to unmask her. When Adam and Kono stop for a car crash victim, they find her driver mate missing although she was crushed unconscious, and following the bloody trail into the jungle are knocked down by masked men dragging them to heir compound. The trio is handcuffed for bloody slaughter, but thanks to Adam escapes to a senior's desolate home, finding him in cahoot and improvising a stand against the horde of sectarian maniacs. Meanwhile Jerry babysits Charlie seasonally and finds party-banned Grace reluctant to come along trick and treating.
—KGF Vissers