Hawaii Five-0's Catherine Rollins is back, but even she is unsure how long she is planning on staying in paradise.

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Departing Hawaii late in season 4, Catherine (Michelle Borth) left her boyfriend and her position with Five-0. After spending the entire season in the Middle East, the former Navy Lieutenant returned to Oahu for Kono's (Grace Park) wedding. This fall, McGarrett (Alex O'Loughlin) will find out just how long she is staying.

"It's not resolved how long she's going to stay," showrunner Peter Lenkov explained, according to The Hollywood Reporter. "Clearly, it's a happy reunion, but it's a little awkward, also, based on how it was all left. They both have a lot to talk about, which they don't really get to in the finale, so I'm hoping that we resolve it at the beginning of next year and decide the fate of Catherine at that time."

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Could the McRollins romance take off once more? McGarrett hasn't dated since Catherine's sudden exit, although he did tell his aunt that the relationship had come to a close. Now, the Five-0 leader will have an important choice to make.

Find out more when Hawaii Five-0 returns to CBS this fall. Click the video below to see a preview for the series' latest episode.

Tags: television CBS Hawaii Five-O