McGarrett creeps around on Halloween night, trying to arrest the killer of two frat boys that were murderers themselves.

Duke reviews the case of the missing high-school girl Lana, including pointing out the most likely suspects.

For the first time in three years, Max returns from Africa to dress up as John Wick at a Halloween party and to help out with a case.

Noelani dressed up as Elton John for Flippa's Christmas party, calling McGarrett and Junior to get them over there.

Kamekona enjoys being a guest instead of having to entertain at the Halloween party Flippa and his mother threw.

Quinn quickly learns that weird things happen on Honolulu on Halloween night, including whatever broke out of a basement safe.

McGarrett's effort to dress up Eddie as a lion to scare trick-or-treaters falls short as Eddie just rolls around cutely.

Tani uses all she learned from mermaid camp when developing her costume for Flippa's Halloween party.

Junior rescues the last suspect in the murder of a missing high-school who had been submerged in a car.

Five-0 investigates a home invasion on Halloween on Hawaii Five-0. "He 'oi'o kuhihewa; he kaka ola i 'ike 'ia e ka makaula (Don't blame ghosts and spirits for one's troubles; a human is responsible)" is the fifth episode of the show's tenth season.