All Hallows Game, penned by Leigh Kelsey, is a bewitching tale that intricately weaves elements of mystery and supernatural to craft a narrative that's both enthralling and haunting. As we delve deeper into the story, readers find themselves immersed in an environment where Halloween is not just a festive occasion but a pivotal element of the plot, imbued with a significance that unfolds in the most unexpected ways.

The novel sets its stage in the quaint, seemingly tranquil town of Eldritch Hollow, a place where Halloween isn't merely celebrated; it dominates. The protagonist, Elena Marlowe, a curious and somewhat reclusive librarian, finds her life irrevocably intertwined with the town's eerie traditions when she stumbles upon a mysteriously ancient game in the archives of her library. This game, known as the All Hallows Game, is rumored to have been played by the town's founders, and with it comes a history of unexplained disappearances and supernatural occurrences that pique Elena's curiosity and fears alike.

Leigh Kelsey does a magnificent job of building suspense and a rich atmospheric tension from the very first page. Her prose is crisp and evocative, painting the autumnal hues of Eldritch Hollow with a vividness that almost allows the chill of its October winds to seep through the pages. The characters are well fleshed out, with Elena's development being particularly compelling. As her investigation into the All Hallows Game deepens, so does her character, revealing layers of bravery and resilience that make her a relatable and admirable protagonist.

The game itself is a character in its own right, a complex puzzle that challenges the boundaries between reality and the supernatural. Each chapter peels back another layer of the game’s dark history, intertwining it skillfully with Elena's personal growth and her relationships with other town residents. What makes the game truly fascinating is its unpredictability - its rules are arcane and its stakes, perilously high. The deeper Elena dives into understanding the game’s purpose and origins, the more she unravels about her own family's secrets and the town’s dark past.

Supporting characters like Jacob, the enigmatic newcomer with secrets of his own, and Mrs. Thorne, the town's historian whose knowledge seems ominously boundless, are instrumental in driving the plot forward. Their interactions with Elena provide depth and complexity, weaving a social tapestry that mirrors the intertwined fates within the town of Eldritch Hollow. Kelsey expertly maintains a balance, ensuring that each character’s backstory contributes to the overarching mystery without overcrowding the narrative.

The climax of All Hallows Game is a crescendo of revelations that satisfies the built-up tension in a manner that is both exciting and thought-provoking. As the final pieces of the puzzle click into place, the consequences of the game reach a fever pitch, challenging the characters’ perceptions of free will versus fate. The resolution of the plot is cleverly handled, leaving readers with a sense of completion while still pondering some philosophical questions that the novel raises about life and legacy.

Moreover, the thematic elements of tradition versus modernity, and the exploration of local folklore, lend a rich cultural backdrop to the narrative, making it not just a tale of supernatural intrigue but also a reflection on how history and folklore can shape communities and individual identities.

However, the novel is not without minor flaws. At times, the pacing seems uneven, particularly in the middle section where the narrative delves into a slower, more descriptive mode that, although beautifully written, might detract from the urgency established in earlier chapters. Additionally, some readers might find the final explanations a bit too convoluted, requiring a suspension of disbelief that verges on the extreme.

In conclusion, All Hallows Game by Leigh Kelsey is a compelling blend of horror, mystery, and history that captivates and chills. It is a testament to Kelsey’s ability to craft a world that's as immersive and intricate as the game at the heart of its story. For those who enjoy novels that combine rich atmosphere with suspense and a touch of the eerie unknown, this book promises to be a satisfying read that lingers long after the last page is turned.