The LAPD, FBI and Interpol work with Monica Stevens in Prague to target high-value terrorists operating within and outside the United States.

When the president visits Los Angeles, the LAPD teams up with the Secret Service to ensure his safety and assess any major threats on their watch list. Meanwhile, Miles's instincts are tested, and Tim takes on a new role.

Nolan makes a quiet arrest, and Lucy and Celina race to rescue a kidnapping victim. Meanwhile, Harper and Lopez help outsmart a killer, and Miles visits a familiar face.

While out in the city, Nolan and Bailey witness a murder in public and immediately spring into action in the hopes of finding the person responsible. Meanwhile, Angela and Wesley have a big life decision that may affect their future.

Lieutenant Grey and the FBI task force enlist the help of an old colleague to uncover a criminal network. Nolan, Miles, Lucy, and Celina respond to a mysterious officer-involved shooting.

It's Valentine's Day, and the team is on the hunt for someone who is setting more than hearts on fire. Meanwhile, Celina thinks Miles' recent string of bad luck is the result of a curse, and she's determined to break it.