Hawaii Five-0

Season 10, Episode 15

Episode Title: He waha kou o ka heʻe (Yours is the Mouth of an Octopus)

Air Date: 2020-02-07

Overview:

When Grover's niece, Siobhan goes missing from the police academy and it's discovered her boyfriend is an undercover member of the Yakuza, Adam may be her only hope of rescue.