Former Pinkerton spy Isabelle Webb needs a vacation. The broken leg she suffered while trying to warn President Lincoln of his impending assassination has mended a little, but her grief over his death has not. She and her young charge, Sally Rhodes, have an open itinerary when they board a steamer ship to Bombay. But upon meeting Utah blacksmith James Ashby, the two women opt to join the search for his younger brother Phillip, who's traveling abroad with the ill-reputed Thaddeus Sparks in search of a mystical treasure.
Isabelle Webb launches a new adventure as she pursues a steamship en route to Egypt carrying two young stowaways: her teenaged ward, Sally Rhodes, and an unlucky girl named Alice Bilbey. Arriving in Suez, Isabelle and her companions recover the girls and unexpectedly encounter Isabelle's own guardian from her youth, Genevieve Montgomery. Isabelle and her friends decide to join up with Genevieve upon discovering that she is funding an expedition to a burial site near Luxor with an entourage of Egyptology experts. Unaware that their nemesis, Thaddeus Sparks, is also in Egypt as part of a jewel-hunting cadre, Isabelle's group joins the expedition under ominous signs: a prophetic warning from a stranger, threats along the Nile River, and birthmarks that burn when the rare Jewel of Zeus is nearby. At the excavation site, a cave rumored to be the tomb of a pharaoh's disgraced daughter. Tension builds when several newcomers arrive. And as circumstances shift with the sands, Isabelle finds that some of the royal treasure in the ruthless pharaoh's desert was buried for lethal reasons.
The sun burns brightly over the ancient isle of Greece as former Pinkerton spy Isabelle Webb returns for her most rousing adventure yet. Legend has it that the location of a fantastic treasure is revealed only when three mystical jewels are united. In an effort to locate the elusive trove and the power it promises, shadowy organizations and greedy men have tirelessly pursued the three hidden stones for centuries. Isabelle and her trusted companions including her dashing fiance, James Ashby are in possession of one of these legendary jewels, while nefarious treasure hunter Thaddeus Sparks retains another. The third stone, the Jewel of Hades, is rumored to be concealed on the rocky shores of Greece. As good and evil converge on this fiery island, the final battle for possession of the jewels and their anciently protected secret begins. When events take a deadly turn, Isabelle must rely on her keen instincts and indomitable spirit as dastardly forces threaten to make her first Greek expedition her last.