Tempest in the Highlands

Miranda MacDonnell is on the run. When she inherited a mysterious relic from her mother, she had no idea the dangers it would bring. Now hunted by a relentless foe who will stop at nothing to find her, she has one choice: stow away on the ship of the notorious privateer, Black Hawk.
Rob Hawkins, the half-English privateer known as Black Hawk, has a mission from the Tudor king to find and kill the rogue commander, Sir Ralph Evers. To complete his quest, Hawk must find Miranda, a young woman Evers is pursuing. Caught in a tempest, he is shipwrecked with a "boy" who demonstrates an uncanny ability for saving him. Cast away on the mysterious Isle of the Dead, Hawk realizes that the "boy" traveling with him is actually Miranda MacDonnell and having her means that Evers will come to him. What begins as a ploy —using her as bait—soon changes, however, as he falls in love with her.
Ancient forces are at work, drawing the four possessors of the relic's power to the Isle of the Dead in the Outer Hebrides for a final battle where good must overcome the forces of evil in this spectacular finale to the Scottish Relic Trilogy.