The Czar's Last Soldier is the story of the search for the Star of Golconda a 42.5-carat diamond slightly smaller than the Hope diamond. Before he was killed, a marine buried the diamond in his foxhole on the island of Corregidor during World War II. Thirty-two years later, at a Nebraska post office, Sam Gibbons and Roscoe Barnes are removing the old post office boxes and replacing them with new ones. Both men are World War II veterans who teamed up as general contractors after the war. When the old post office boxes are removed a letter hidden between warped boards falls to the floor. The letter, dated 1942, is from the marine who died on Corregidor and gives the particulars of a jewel theft he committed at the Shanghai Officer's Club in 1941. As there are no members of the marine's family still alive, they read the letter. Shortly after the theft, the marine's regiment was transferred from China to the Philippines. After the Japanese attacked Pearl Harbor, the regiment was tasked to defend Corregidor. When the order to surrender was given, not wanting the Japanese to gloom onto the stolen jewels, the marine buried them. Sam and Roscoe hunt for the jewels but are unaware they were stolen from a czarist officer and are thrust into the middle of an international legal battle.