Riddle of the Diamond Dove - N. S. Wikarski - Bog

During the untold millennia before patriarchy was conceived, the world was a very different place. Nothing concealed stays buried forever.
THE ARKANA SERIES
The forgotten past refuses to stay buried in an artifact hunt spanning continents, centuries, and lost civilizations. The prize is a cache of myth-busting relics that could rewrite history or end it completely. When a secret society squares off against a ruthless fundamentalist cult, only one faction can win. More importantly, only one will survive.
Volume 4 - Riddle of the Diamond Dove
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.