Making matters worse, her handler is to be David Poole, a fellow agent who manages to be both strait-laced and dashing in annoyingly equal measure. However, Evelyne soon realises that Blackthorn Park is more than meets the eye, and an upcoming visit from Winston Churchill means that security at the secret weapons research and development facility is of the utmost importance.

When Evelyne discovers Blackthorn Park’s chief engineer dead in his office, her simple assignment becomes more complicated. Evelyne must use all of her - and David’s - detection skills to root out who is responsible and uncover layers of deception that could change the course of the war. With mystery, intrigue, and the hints of romance international bestselling author Julia Kelly is known for, Evelyne Redfern returns in Betrayal at Blackthorn Park.