The Devil's Saint by D.M. Roberts is a gripping novel that masterfully blends historical fiction with elements of mystical intrigue. Roberts' storytelling pulls the reader into a dark, evocative journey through 17th century Europe—a period rife with religious fervor and political upheaval. This novel, at its core, explores the themes of redemption, human frailty, and the elusive nature of truth.

The narrative follows the enigmatic life of Jean Moreau, a priest in a small French village who is haunted by his secretive past and a mysterious curse that seems to shadow his every step. Roberts does an excellent job in slowly unfolding Moreau’s backstory, which is intricately linked with the occult and the dark arts. The author’s ability to weave historical details with supernatural elements is both seamless and compelling, making the setting of the novel not just a backdrop but an active character in the plot.

What distinguishes The Devil's Saint from many historical novels is its deep dive into the psychological depth of its characters. Moreau, as painted by Roberts, is a complex protagonist whose profound internal conflicts drive the narrative forward. His interactions with other characters, especially with the enigmatic Elisabeth—a woman who arrives in the village under mysterious circumstances—reveal layers of tension and moral ambiguity that are truly fascinating.

The prose used by Roberts is both rich and poetic, capable of constructing vivid imagery in the mind of the reader. Descriptions of the bleak, yet strangely beautiful European landscape in winter months, the chilling winds that seem almost like a harbinger of doom, and the rustic life of the village are all rendered with a meticulous attention to detail. This not only sets the mood but also deepens the immersive experience of the historical period.

The plot of The Devil's Saint is well-constructed, with multiple twists and a tension that builds steadily towards a climax that is both shocking and thought-provoking. The interplay between doctrinal church politics and the clandestine practice of ancient rites presents a thrilling dichotomy that challenges the conventional notions of good and evil. Themes of betrayal, love, and the quest for power are explored in a manner that is both nuanced and fresh, making each plot development feel significant.

Roberts also does not shy away from the harsher realities of the 17th century. The depiction of the ruthlessness of the church, the superstition that pervades the common folk, and the harshness of daily survival contribute to a bold, unromantic portrayal of the era. This stark realism serves to compound the central conflict involving Moreau and his secretive past, driving home the personal and societal struggles that intersect throughout the novel.

Critically, one of the most impressive aspects of The Devil's Saint is its dialogues. Dialogues in the novel do not just carry the plot but also reveal the philosophical underpinnings of the characters’ beliefs and motivations. The conversations between Elisabeth and Moreau, in particular, are laden with double meanings and foreboding, reflecting the complex interpersonal dynamics that Roberts masterfully captures.

The pacing of the book might be slow for some, particularly in the beginning where the setting and characters are being established. However, this deliberate pacing is crucial for building the atmospheric tension and depth, which are central to the novel's impact. Once the story picks up, it transitions into a compelling page-turner.

In conclusion, The Devil's Saint by D.M. Roberts is a standout novel in the realm of historical fiction with a supernatural twist. It not only promises an engrossing tale of intrigue and secrecy but also delivers a profound commentary on the human condition. The lush prose, complex characterization, and the hauntingly beautiful setting make this book a must-read for fans of the genre. Roberts has crafted a world that feels ominously real and characters who are both flawed and fascinating. For those who are intrigued by history, mystery, and the philosophical questions of morality, this novel is a deeply satisfying read.