Clay Bonnyman Evans was 5,000 miles from home, deep in a pit on the Pacific island of Betio, when he heard the words his family had awaited for so long. "It's gold," announced Kristen Baker. With a brush, the archaeologist gently swept the sand off an unmistakable shape: a human skeleton — with a mouth full of gilded fillings. "It's gold." Two words to end a 71-year wait. Two words to solve a mystery that had vexed Evans's family for four generations. Two words to give a long-lost war hero the happy ending he deserved. First Lt. Alexander "Sandy" Bonnyman...