Stana Katic is one half of TV’s favourite couple on Castle, but she’s bonding with a whole new cast on set of her upcoming indie film, Sister Cities.

“I thought that they did a really good job of bringing together some really ballsy chicks,” Stana tells ET Canada from the LA-based film set.

Sister Cities revolves around four estranged sisters who reunite to mourn their mother’s death. It co-stars Troian Bellisario (Pretty Little Liars), Jess Weixler (The Good Wife) and Michelle Trachtenberg (Gossip Girl, Buffy the Vampire Slayer) as Stana’s sisters.

“I’ve always wanted sisters,” says Jess, “so it’s kind of a dream come true to get three of them in this movie.”

To make their sisterly bond all the more convincing, the actresses did some real life bonding off screen.

“We filmed in this gorgeous old house that was originally built in 1882,” Michelle explains, “and we all had a sleepover there at night, it was just us and the ghosts.”

Nothing says relationship-building like scary spirits from the afterworld!

“It was very special, and I think you’ll see that on screen,” adds Michelle.

Sister Cities is scheduled for release in 2016.

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