"We can see ourselves in each of these people, and that's the point of storytelling,” Seyfried tells PEOPLE of the show, now streaming on Peacock

Seyfried plays Michaela “Mickey” Fitzpatrick, a Kensington patrol officer who discovers a string of murders in the neighborhood’s drug market. As Mickey attempts to locate the killer, and find her missing sister Kacey (Ashleigh Cummings), she confronts dark memories from her childhood spent in the neighborhood.

For Amanda Seyfried, the Peacock limited series offered a rare opportunity to play a character adapted from a book while working closely alongside the author, Liz Moore.

I've always wanted to play a cop,” Seyfried says. “It's like a childhood dream to play somebody that I just was always in awe of, even though it's funny [because] I'm not g

The eight-episode adaptation of Liz Moore's novel tells a story of sisterhood, addiction and murder set in the Kensington neighborhood of Philadelphia.

Played by Amanda Seyfried, with a disconcerting intensity that echoes her Emmy-winning portrayal of fraudster Elizabeth Holmes in The Dropout, the protagonist of Peacock’s Long Bright River is a bright young woman and a talented English horn player.