When Detective Raimy Sullivan discovers that she can communicate with her deceased father on an old ham radio, she warns him of events that will lead to his death so he can circumvent his fate.
Raimy tells Frank, over the ham radio, that her mom will be murdered unless he can find a way to warn her; Frank gets bad news about Stan Moreno; Raimy follows a lead in the Nightingale case, while Frank and Satch follow the same lead in 1996.
Raimy relays new evidence about the Thomas Goff case to Frank, prompting him to take matters into his own hands, despite a warning from Satch; Raimy has an interesting encounter with Daniel.
With the date of Julie's abduction fast approaching, Raimy and Frank each gather information from someone with a link to the Nightingale; Raimy meets someone from her past.
When Frank helps Raimy with a case in the present day, she has two different memories of her first day in the NYPD; Frank has trouble controlling his jealousy while trying to give Julie her space.
Raimy meets Karl, who speaks to himself in the future; Raimy and Frank plan to use the Nightingale's next victim as bait.
Detective work begins to pay off for Raimy and Satch, when a cold case victim leads them to where Nightingale held his first victim.
Frank investigates when Raimy tells him about an unexpected connection to the Nightingale's first kill; Frank and Julie have an open conversation; Raimy receives a visitor.
Raimy and Frank discover some startling information about the Nightingale killer; Frank is faced with a shocking betrayal.
When a plan is put in motion to kill the Nightingale, Frank agonizes over whether it's the right thing to do; Raimy is confronted with a moral decision.
Raimy and Frank discover that they are in the thick of things; Frank identifies the meaning behind a betrayal.
Frank and Raimy make an incredible discovery in their search for the Nightingale; Stan is determined to do whatever it takes to take Frank down.
Raimy makes a startling discovery and reaches out to Frank to express her concerns; truths come to light.