Catherine's life is on the line, and it's all thanks to Hawaii Five-0's new Russian spy.

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Confidential NSA intel will wind up in the wrong hands during "Waiwai (Assets)," and while Cath (Michelle Borth) busy doing who knows what in god knows where, it will be up to the Five-0 team to track down the leak that could get her killed.

Anna Novick (Olga Fonda), an agent from the land of vodka and trooper hats, will put McGarrett's (Alex O'Loughlin) team through their paces as the former Navy SEAL finally learns the truth about Catherine's departure.

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"Fonda will appear later this season as Anna Novik, a spy who uses deadly tactics to obtain important stolen intel," TV Line teased. "Needless to say, she quickly finds herself a target of the Five-0 team."

The security threat will cause Five-0 to bring out the big guns - literally. Photos for the March 11 episodes have the team armed to the teeth, but unfortunately, their foe remains unseen. Will their best efforts be all for naught?

Find out if Anna will slip away when Hawaii Five-0 airs Fridays at 9 p.m. ET on CBS.

 Hmmmmmmmm.... #H50 editing

A video posted by plenkov (@plenkov) on Jan 26, 2016 at 5:18pm PST