Murder, mystery and Pyongyang palace intrigue: Director Ryan White’s compelling new documentary about the killing of Kim Jong Un’s half-brother, “Assassins,” has all the hallmarks of a Hollywood thriller — but the story it tells is real.

On Feb. 13, 2017, Kim Jong Nam died after two women smothered his face with deadly VX nerve agent at Malaysia’s Kuala Lumpur International Airport. Both women claimed in court that they thought the assignment had been part of a prank show.

“Assassins” attempts to make sense of what happened using CCTV footage and extensive interviews, while painting a generally sympathetic picture of