Didn’t you have something like this, disguised as a bird, in one of your books?
“Foreign Enemies and Traitors”, perhaps?
Not in a book, just in a link to a story.
There are “flapping” (no rotary propellers) drones that resemble dragon flies, birds etc.
Solar powered, they can be directed to land in the line of sight of their target, waiting. They could wait for days or weeks, just looking for that one programmed face. When the camera eye recognizes the target person, it flies in and explodes against their head.
That’s all available right now, today.