No Rhyme or Riesling, authored by G.R. Lyons, is a captivating blend of mystery and romance set in the serene backdrop of California’s wine country. This novel not only woos the reader with its intricate plot and engaging narrative but also sates the palate with vivid descriptions of vineyards and the winemaking process, making it a delightful read for mystery enthusiasts and wine lovers alike.

The story is centered around Max Hollingsworth, a sommelier-turned-amateur detective, who is drawn into a suspenseful whodunit after a series of mysterious deaths in the vineyard where he works. The beauty of Lyons' writing lies in his ability to weave the technical intricacies of winemaking with the suspense of his storyline. This enhances the book’s setting, offering a lush, evocative backdrop that acts almost as a character in its own right.

Max, the protagonist, is a well-crafted character, imbued with a depth that is gradually revealed as the story unfolds. Struggling with his own personal demons and the shadows of a past career in a bustling city, he finds solace in the rhythmic patterns of vineyard life. However, peace eludes him as he finds himself embroiled in the investigation, challenged to use his unique set of skills to uncover the truth. The author does a commendable job in developing Max’s character, making him relatable and his personal growth, believably inspiring.

The secondary characters, from the enigmatic vineyard owner to the spirited winemaker, are equally well-drawn. Each character complements the narrative adding layers and enriching the plot with their distinct personalities and secrets. Lyons skillfully crafts dialogue and interactions that reveal tension and alliance, propelling the plot forward and deepening the mystery.

What sets this novel apart is how seamlessly Lyons integrates the essence of winemaking into the mystery. The reader is treated to fascinating insights into the complexities of viticulture and vinification which are effortlessly tied to the progression of the story. This expert blending of facts and fiction not only educates but also adds an authentic flavor to the storyline, making the reader feel intimately connected to the vineyard's life cycle amid the unfolding drama.

The mystery element of the book is meticulously plotted. Lyons drops subtle hints and red herrings alike, keeping the readers guessing till the end. The twists are unpredictable and satisfying, layered with emotional depth and philosophical undercurrents on human nature and justice. As the investigation deepens, the suspense builds, transformed by expert pacing that Lyons manages to maintain throughout the book. This steady build-up culminates in a climactic reveal that is both shocking and thought-provoking.

In terms of writing style, Lyons’ prose is crisp and evocative. He has a knack for creating vivid imagery - one can almost smell the grapevines and taste the dusty earth of the vineyard. The narrative flows smoothly, with just enough detail to paint the scene without bogging down the pace. The winemaking details are intricately woven into the narrative, never feeling out of place or forced.

The romantic elements of the story, though not the main focus, provide a soothing contrast to the tense mystery. The romance is subtle and sweet, developing in a slow burn that feels natural and believable. It provides a refreshing reprieve from the tension of the investigation, adding yet another layer to Max’s personal growth and his interactions with other characters.

Additionally, Lyons addresses themes of loss, redemption, and the pursuit of happiness with sensitivity and grace, avoiding clichés and instead presenting a nuanced exploration of these universal experiences. This emotional resonance is what rounds out the book, giving it a depth that goes beyond the typical mystery or romantic novel.

In conclusion, No Rhyme or Riesling by G.R. Lyons is a compelling tale that deftly combines the elements of mystery and romance with the fascinating world of winemaking. It is a novel that promises – and delivers – intrigue, emotion, and a deep appreciation of the art of winemaking. Lyons has crafted a world that feels as real as it is enchanting, making it easy to recommend this book to not only mystery and romance readers but also to anyone interested in wine or seeking a profound story that explores the complexities of human nature and the redemptive power of finding one's true place in the world.