Mel goes undercover as a volunteer for a rising politician when McCall tries to help a despondent college student being threatened by someone inside the candidate's campaign. Also, McCall worries when Delilah starts hanging out with a young girl who served time in juvenile detention and reminds McCall of her own troubled youth

McCall races to find a woman kidnapped by a serial killer whose past crimes went undetected because the victims were from marginalized communities. Also, trouble arises for McCall when her vigilante activity puts her on Manhattan District Attorney Avery Grafton's radar.

An overseas call for help from the daughter of McCall's deceased CIA mentor forces McCall, Mel and Harry to work remotely to aid the conflict journalist as she's pursued by a hit squad in France. Also, Aunt Vi becomes suspicious when McCall skips out on another family night for work.

McCall races to help a concerned wife locate her husband before he helps an extremist group carry out an imminent bombing in the city. Also, McCall worries that her anonymity will be compromised when Delilah asks her to participate in a mother/daughter social media video.

McCall's personal and professional lives collide when Delilah and her friends are threatened by a European crime syndicate for being eyewitnesses to the outfit's execution of a drug cartel boss.