In 1962, Egypt's Missile Program Lost Its Key Scientist Without a Trace

https://archive.ph/d7dLv

If you want an interesting related story that's so incredible people wouldn't believe if it was a film plot, look up Otrag. Not the Wikipedia page, that only tells a fraction of the full story. There's a documentary floating around somewhere about their work in Zaire under Mobutu before they started building ballistic missiles for Gaddafi.