After a life-changing discovery, Buck Reilly embarks on his greatest adventure, which threatens to 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 killed.

The breathless pace will carry you deep into the night as Buck races against the clock to overcome a double-cross that will cut him to the core as he faces-off against the coldest, most brutal circumstances one could endure. The journey leads to the ends of the earth, where no amount of treasure can overcome the deep treachery Under the Charcoal Sky.