go? >> with him, i suppose. i didn't find out anything about diamonds until after he had left. >> diamonds, light, untraceable. just the kind of tip that's found in a book michelle discovered among mark's things after he left. michelle came to see that her husband had been planning his vanishing act for months. >> he had apparently packed two huge suitcases full of water filtration systems, gps equipment, language tapes. all types of bizarre things, and he shipped one of the bags to kahn and another bag to athens. >> a meticulous plan, perfectly executed, though even in hindsight michelle now remembered how nervous he had been on the day they flew to greece.