James Claythorne's debut novel, "Codename Ashton",  lends itself to a long history of spy thrillers, mystery and stories with complex characters and historical elements. 

"Codename Ashton", would appeal to readers with an interest in the Cold War era and its aftermath and would find the setting and themes particularly enagaging. The story's exploration of betrayal, revenge, and family secrets would resonate with a broad audience, including those who enjoy character-driven narratives and intricate plotlines.