Under the Charcoal Sky bynew to me author J.H. Cunningham, published by Storm Publishing, is book 12 in the Buck Reilly Series.
An incredible read, excellent writtenfull of suspense, unexpected twists and turns.
Blurb: After a life-changing discovery, Buck Reilly embarks on his greatest adventure, which could be his last. The identity of the woman who gave him life is a closely guarded secret for reasons that go far beyond her own short existence. As Buck pursues information that has been fiercely hidden in Scotland for generations, it puts him and his friends in the crosshairs of a secret society whose sole purpose is to eliminate any threat of exposing the truth. Their lives depend on Buck finding missing ancient documents and treasure, impossibly fast, or they will all be in great danger.