On July 1, 2007, relatives mourned Ashraf Marwan, the son-in-law of Egyptian president Gamal Abdel Nasser.
Four days earlier, he mysteriously fell off the balcony of his luxury flat in London.
Egypt's president at the time, Hosni Mubarak, couldn't attend the funeral as he was away at a summit, but he called Marwan "a true patriot of the country." But privately, to many, Marwan was the greatest traitor in Egypt's modern history.
Because, for years, Ashraf Marwan was working for Mossad, Israel's elite intelligence agency.
He wasn't just any agent; he was Mossad's most valuable source.
In the face of a great catastrophe in 1973, his warning may have helped save Israel from defeat. Nasser never liked his son-in-law.
Though Marwan's pedigree was solid: his father was a major general, his grandfather the chief of Egypt's Sharia courts, And he'd served as a chemist in the army, Nasser thought he was too opportunistic and loved luxury a little too much.
Nasser's daughter Mona insisted, and they married in July 1966.
Soon after, Marwan went to London for a master's in chemistry and slid into gambling debt so deep that a friend had to bail him out.
Nasser was furious, and yanked him back to Cairo and parked him in the President's office on the lowest salary under the watchful eye of his chief of staff, Sami Sharaf.
