Hawaii Five-0 officially has a mole.

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It's not the first time, and it probably won't be the last. Once upon a time, McGarrett (Alex O'Loughlin) had to worry about coworkers selling him out to Wo Fat. Now, the team has the FBI breathing down their necks. While Danno (Scott Caan) is aware that the Bureau is leading some sort of witch-hunt, no one in Five-0 knows that Abby (Julie Benz) is feeding them info.

Before long, however, Ms. Dunn will need to choose a side.

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"She's working for federal prosecutor Robert Coughlin (played by Ingo Rademacher), who has his own personal agenda as to why he wants to take down Five-0," the actress explained to TV Line. "When his agenda comes out, it really puts Abby in a bind because she doesn't like to be manipulated."

Combined with her very real feelings for Chin (Daniel Dae Kim) and her burgeoning trust in Five-0, this betrayal may make Abby unable to complete her mission.

"She really does feel that what Five-0 stands for, what they're doing, is great, and she has not observed any abuse of power," Benz explained. "She's put in a really tough position where she has to decide between doing her job and following her heart."

Do you think Abby will eventually side with our heroes? Sound off in the poll below!

Hawaii Five-0 airs Fridays at 9 p.m. ET on CBS.

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Hawaii Five-O, Television, CBS