Gabriel Waincroft is not yet content with the mayhem he has wrought on Hawaii Five-0. As the CBS series heads into its winter hiatus, Chin's former brother-in-law will strike again.

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Last Friday's episode proved that Gabriel has his hands in more than one honey pot. From exacting revenge upon Adam and cutting deals with the Yakuza to executing arms dealers and planting a virus at Five-0 HQ, the rising star of Oahu's underworld is busier than ever. Soon, his plans will turn the series on its head.

Fans should keep their eyes peeled for a "big turn" during Hawaii Five-0's midseason finale.

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"It's definitely going to affect Kono and Adam's relationship," series creator Peter Lenkov said of episode 10's big shakeup, according to TV Guide. "That threat is not going away. ... He's definitely a big presence in their lives and everybody else's."

Out of all Gabriel's (living) victims, Kono and Adam seem to be suffering the most. Gabriel's conveniently timed buy out of Adam's death turned the businessman into a murderer, and Kono's husband closed out "Piko Pau 'iole" by turning himself into the police. While Adam was acting in self-defense, the future looks bleak for the newly weds.

Find out more when Hawaii Five-0 airs Fridays at 9 p.m. ET on CBS.

Tags: Hawaii Five-O television CBS