When treasure hunters Jack Harvey and Emma Morgan recover a mysterious gemstone, they uncover more than an artifact they hold the key to a centuries-old enigma: the lost Crown Jewels of King John. What begins as a routine salvage mission explodes into a perilous global chase. Pursued by the Coalition, a ruthless organization obsessed with these legendary stones for eight hundred years, Jack and Emma must decipher a cryptic 1920s diary and track down four more gemstones scattered across the world. But the stones are only fragments of a greater puzzle-an ingenious system devised by an ancient alchemist named Alara to shield her secret from those who would wield it for evil. Only the worthy can survive her trials and unlock the truth behind Crystal Haven.From the volcanic depths of Mount Teide to Croatia's shimmering Blue Cave, through Bosnia's rainforests and Scotland's windswept shores, Jack and Emma face impossible challenges, deadly adversaries, and a race against time. When Emma is kidnapped, the hunt becomes personal-and failure means more than death. A pulse-pounding thriller of historical mystery and high-stakes adventure, Crystal Haven will keep you breathless until its final, shocking revelation.