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.

In Peacock's TV adaptation of "Long Bright River" Amanda Seyfried portrays a Philadelphia cop desperate to stop a serial killer and find her sister.