Detective Raimy Sullivan has carried around pain and resentment over her father's death for 20 years, believing NYPD Officer Frank Sullivan was corrupted during an undercover sting and got himself killed. Everything changes when she hears his voice coming from his old ham radio, somehow transmitting from 1996. Raimy tells Frank about his murder, allowing him to survive the event, but the change has tragic consequences on the present, and the two detectives must find a way to rewrite the past without destroying everyone they care about.