First class passengers are turning up dead left and right in LAX, leading Angie Tribeca to a blast from the past in the form of a very perky, obnoxious, second cousin. 

After another passenger is found dead on a flight, Geils and Tribeca head to the crime scene, only to be interrupted by Tribeca's cousin, Vivian Tribeca, an optimistic flight attendant, who hits it off with Geils. 

Later, while Geils and Vivian are on a date, Angie's jealousy unfolds, but mostly because she finds her cousin very, very annoying. 

A breakthrough in the case prompts an uncover op for the team as they search for an asthmatic murderer, whose attack of choice is smothering. Including the lieutenant, who poses as the pilot and has no idea how to fly a plane. 

Meanwhile, Tanner is forced to spend time aboard the plane with a single mother, who has been on board for each murderous flight with her three rowdy children.

When an angry passenger causes a scene, the killer snaps and begins to assault the man. The only problem? The killer is Tribeca's second cousin, Vivian. Her facade shattered after the rude man yelled at her over something out of her control, representing the true world of customer service.