On or about this date in 1974, a young American traveler — or perhaps intelligence agent — named Charles Dean and his Australian friend Neal Sharman are believed to have been executed in Laos by the Pathet Lao guerrillas. The 23-year-old Dean was in the midst of a protracted post-university globetrotting when he was apprehended with his friend traveling down the Mekong River in the war-torn country. They were held in captivity for three months — long enough for the family to learn they were detained, and Dean’s father to fly to Laos to negotiate in vain for his release....