Officer Gail Peck has been on a roller coaster throughout Season 4 of Rookie Blue, from going back on full duty and in-and-out of relationships.

In an interview with Starpulse on Tuesday, this week's episode, "Under Fire" won't be any better for Gail.

"Under Fire" is the last episode before the season finale, and there's more going on besides tracking down a shooter. Charlotte Sullivan, who plays Gail revealed details about her newfound bond with medical examiner Holly (Aliyah O'Brien).

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"I think Gail has so many different layers," Sullivan said "and I think what's so interesting about this Holly relationship is we're getting to see a more let-down, silly and awkward and playful [version], because Holly is in fact really cool, and Aliyah is actually really cool in real life. In real life, I'm awkward around her. I get to play those things and use them! Gail's so much fun."

Sullivan revealed that Gail is still coping with her best friend Andy McNally and ex-boyfriend Nick Collins' new relationship.

"Certainly me as Charlotte thinks you don't ever break that trust and you don't ever be with a friend's ex-boyfriend," she said. "That creates a really interesting tension between Andy and Gail. I think Gail actually really likes Andy and really looks up to her."

"Rookie Blue" stars Missy Peregrym as Andy McNally, Gregory Smith as Dov Epstein, Charlotte Sullivan as Gail Peck, Enuka Okuma as Traci Nash, Travis Milne as Chris Diaz, Peter Mooney as Nick Collins, Ben Bass as Sam Swarek, Priscilla Faia as Chloe Price and Rachael Ancheril as Marlo Cruz.

Matt Gordon starts as Oliver Shaw and Lyriq Bent as Frank Best.

Under Fire was co-written by Rookie Blue's own Gregory Smith.

The show airs tonight at 10 pm on ABC.

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Rookie Blue