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Expedition Indigo by Stacy AllenArchaeologist Riley Cooper is offered the chance of a lifetime: to find the Crux Fidelis, the coronation cross of Charlemagne. Under Water Sea Adventures members believe they have found the remains of the Indigo, a heavily laden cargo ship commissioned by Charlemagne and presumed lost on its maiden voyage off the coast of southern Italy in the early 800s. If Riley can find the cross, it will prove Charlemagne’s coronation as the First Holy Roman Emperor by Pope Leo III on Christmas Day had not been a spontaneous act, but rather a desperate political maneuver by a Pope in need of protection. When Riley joins UWSA off the coast of Sorrento, Italy, tensions and tempers fly as a competing team arrives in search of the treasure and an approaching hurricane gains strength and heads straight toward the dive site. And when one of the crew is murdered, Riley must find the strength to fight back and keep the treasure out of the other team’s hands.

EXPEDITION INDIGO is available from Amazon and Audible.


“Intrigue, espionage, engaging characters, a clever backdrop and an intelligent conclusion, what more could you ask for in a thriller. This one singes and tingles with heaping doses of adrenalin. Enjoy.” ~Steve Berry, #1 New York Times and Internationally Bestselling Author

“Stacy Allen writes adventure as one who has lived it. In Expedition Indigo, the tension, suspense and action come across in an incredibly real and personal way. Her heroine, Riley Cooper, is a great addition to the literary world of explorers. Genuine, innocent in some ways, and brave, a welcome change from a world of hardened heroes with dark pasts. I cannot wait to read more of her adventures.” ~ Graham Brown, author of The Eden Prophecy


Stacy Allen holds an Advanced Open Water Diver certificate and is also NITROX certified. Her passion for adventure has taken her to five continents to explore many countries. Stacy Allen also plays guitar and sings, when she isn’t traveling around the world in search of new locales and new stories. Her love of history, treasure hunting, Italy, archaeology and wreck diving helped her craft this vibrant, fresh novel, the first in the Riley Cooper series. Stacy Allen served on the Board of Trustees of the Pacific Northwest Writers Association, the Pacific Northwest Mystery Writers of America chapter, and currently serves as Vice President of the Southeast Mystery Writers of America (SEMWA) chapter. She is represented by Jill Marr, of Sandra Dijkstra Literary Agency. She lives in Georgia.