Tully, the third collaboration between director Jason Reitman and screenwriter Diablo Cody, who previously worked on Juno and Young Adult together, premiered at Sundance last week.

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The film centers on Marlo (Charlize Theron), an overworked suburban mom with two kids and one more (unplanned) one on the way. Meanwhile Marlo’s husband, Drew (Ron Livingston), is fairly oblivious to his wife’s physical and emotional exhaustion.

Enter Tully, a night nurse: Played by Mackenzie Davis (Black Mirror’s “San Junipero” episode) she’s a millennial Mary Poppins, saving Marlo from her impending breakdown. The two bond and their connection evolves, until Marlo eventually develops romantic feelings for Tully.

This isn’t the first time Theron has played queer on the big screen: In the 2017 action thriller Atomic Blonde, she was badass bi spy Lorraine Broughton. And of course she won the Oscar for portraying lesbian serial killer Aileen Wuornos in 2003’s Monster.

Tully arrives in theaters April 20, 2018.

Zachary Zane is a writer and activist whose work focuses on sexuality, culture, and academic research. He has contributed to The Washington Post, Rolling Stone, and The Advocate.