College freshman Cassie Forsythe wakes from a disturbing nightmare after seeing her sister being murdered by a man in a cowboy hat who demands something called "the key". Her dream morphs into frightening reality when her sister is found dead, exactly as her vision foretold.

Cassie's life takes an even more bizarre turn once she learns that her dead sister, an antique dealer, has discovered the location of a cache of priceless Minoan artifacts. A secret society called the Arkana and a fanatical religious cult known as the Blessed Nephilim are each determined to claim the prize.

Caught squarely between these rival factions is Cassie herself, after she stumbles across the only known map to the treasure. The girl allies herself with the Arkana in hopes of staying alive. With Nephilim assassins on her trail, that's easier said than done.

In Riddle of the Diamond Dove, the Arkana and the Nephilim hunt for buried relics in Africa. They must sift an entire continent - their only lead a riddle carved onto a mysterious bird sculpture. Even as the Arkana team struggles to decipher the clue, new dangers hover over their colleagues at home.

A Nephilim henchman, sent to track down the runaway bride of the cult's leader, creeps ever closer to her hiding place among the Arkana. Troubles multiply when another Nephilim operative recruits a clever ally who might be more than a match for the opposing side.

As the forces of the Arkana and the Nephilim converge on a ruined city in a forgotten corner of the dark continent, the shocking outcome is beyond anyone's powers to foresee. The quest for lost artifacts will veer in an unexpected direction once both sides solve the riddle inscribed on the wings of the Diamond Dove.

For fans of archaeology adventure, alternative history thrillers, and treasure hunt mysteries.