Simon Harris, not yet Taoiseach but a rapidly rising minister, received an unusual package. It contained no official documents or party papers, just an old, yellowed map and a small box. Inside was the one thing that made him hold his breath: a perfectly cut emerald, known as the "Green Diamond" of the Irish Crown Jewels.
This was the key to one of the most famous, yet unsolved, crimes in the country’s history—the theft of the Irish Crown Jewels in 1907. A crime shrouded for over a century in legends and whispers of secret plots.