Frequency - Season 1

Detective Raimy Sullivan has always wanted to prove that she is nothing like her father. In 1996, when Raimy was 8 years old, NYPD Officer Frank Sullivan left Raimy and her mother, Julie, behind when he went deep undercover, got corrupted, and got himself killed. Or so the story has always gone. Few people knew about the secret undercover sting operation Frank was really charged with, led by Stan Moreno, who has now risen to Deputy Chief of Police. Frank's former partner, Lieutenant Satch Reyna, is now Raimy's mentor and friend, and he has urged her to let go of the hurt and anger she still feels about Frank's disappearance and death, but the old pain still lingers. Raimy can barely bring herself to discuss Frank, even with her devoted boyfriend, Daniel, or her childhood friend, Gordo. Now, twenty years later, Raimy is stunned when a voice suddenly crackles through her father's old, long-broken ham radio - it's Frank, somehow transmitting over the airwaves and through the decades from 1996. They're both shocked and confused, but Raimy shakes Frank to the core when she warns him that the secret sting he is undertaking will lead to his death. Armed with that knowledge, Frank survives the attempt on his life. But changing history has dramatically affected Raimy's life in the present - and there have been tragic consequences. Separated by 20 years, father and daughter have reunited on a frequency only they can hear, but can they rewrite the story of their lives without risking everyone they love?.

When Raimy and Frank speak over the ham-radio and she lets him know that her mom will be murdered unless Frank can figure out a way to warn her, she also delivers devastating news regarding Stan Moreno. Meanwhile, in 2016, Raimy follows a lead in the Nightingale case, and in 1996, Frank and Satch work together to follow the same lead.

When Raimy uncovers evidence in the Thomas Goff case, she relays this information to Frank over the ham radio, which prompts him to take matters into his own hands while ignoring a strong warning from Satch. Meanwhile, Gordo talks Raimy into going out for a drink where she has an interesting encounter with Daniel, who still considers her a complete stranger and possible stalker. Lastly, Raimy struggles to adapt to life without Julie, and Frank tries to adapt to life with her.

With the date of Julie's abduction rapidly approaching, Raimy and Frank each work to gather information from a girl whose mother was taken by the Nightingale. Meanwhile, Raimy meets Kyle who immediately remembers her from a brief encounter in the past. She doesn't recognize him at first, but flashes of their night together come rushing back to her.

When Frank helps Raimy uncover clues from the past to help solve a present day murder case, it brings up two different memories of her first day in the NYPD. Through Frank, Raimy continues to learn more about Stan which begins to cause friction with Satch. Meanwhile, Frank has trouble controlling his jealousy as he struggles to give Julie her space.

In 2016, Raimy meets a strange character named Karl, who speaks to himself in the future. In 1996, Frank feels like he's being taunted by the Nightingale. Meanwhile, having discovered new information, Raimy and Frank set up a plan to use the Nightingale's next victim as bait.

A cold-case victim leads Raimy and Satch to a big break in the investigation, a room where the Nightingale held his first victim.

Raimy and Satch discover a shocking connection to the Nightingale's first kill. When Raimy shares this news with Frank, he works to dig up additional information. Meanwhile, Frank and Julie are forced to have an honest conversation, and Raimy has a surprise visitor.

Raimy and Frank make a startling discovery about the Nightingale killer. Meanwhile, Frank is blindsided by a shocking betrayal.

Frank and Raimy put a plan in motion for Frank to kill the Nightingale. Frank finds himself agonizing over whether it's the right thing to do, and Raimy is confronted with an unexpected moral decision.

Raimy and Frank find themselves in the thick of things. Meanwhile, Frank learns the meaning behind a betrayal.

Raimy and Frank make a huge discovery while continuing their search for the Nightingale. Meanwhile, Stan is willing to do anything to bring Frank down.

Raimy makes a discovery that stops her cold. She quickly reaches out to Frank on the ham and voices her concerns. Meanwhile, truths are revealed.