Balthazar Season 4 Episode 1 In Full Flight

Balthazar is having a blast on an ice-driving circuit, a reckless pastime he's enjoyed since his life was upended seven months ago. But on his flight back to Paris, several passengers have convulsions after being poisoned, and the killer is on board. With a plane that threatens to crash and an explosive encounter with a cop he"ll have to work with, can Balthazar ensure a safe landing?