In the contemporary romance genre, Leonie Slade’s debut novel, Yours, Truly, is a breath of fresh air, bringing a mixture of sharp wit, emotional depth, and a vibrant, compelling narrative. The novel centers around Nora Holliday, a successful graphic designer in bustling New York City, whose life takes a dramatic turn when she stumbles across a series of love letters from the 1950s, penned by a woman named Evelyn Beckett.

The plot weaves two parallel stories, transitioning seamlessly between past and present. In the modern era, Nora, grappling with her own turbulent romantic relationships and a demanding career, finds solace and inspiration in Evelyn’s heartfelt epistles. Evelyn’s narrative, set against the post-war backdrop of the 1950s, provides a stark contrast with its own set of challenges and societal expectations. Slade excels in her ability to create empathy and resonance between characters separated by decades, linked through shared emotional landscapes and existential queries about love and purpose.

Slade’s narrative technique is particularly noteworthy. She employs a dual narrative structure that enriches the reader's understanding of both protagonists. Each chapter begins with a letter from Evelyn, written in exquisite prose that captures the zeitgeist of the 1950s. Following each letter, the focus shifts back to Nora, who reflects on her own life in light of Evelyn’s experiences. This method not only enhances the thematic depth of the story but also maintains a rhythmic momentum that keeps the reader engaged from start to finish.

Character development in Yours, Truly is profound and thoroughly executed. Nora, with her modern-day dilemmas, is a character many will find relatable. Her journey of self-discovery, prompted by her connection to the past, is portrayed with both vulnerability and strength, making her a memorable and inspiring protagonist. Evelyn, though only known through her letters, emerges as a strong-willed and passionate woman, her voice resonating off the pages, evoking a strong sense of nostalgia and admiration.

Moreover, the thematic exploration of love and loss, connection and rejection, dreams and reality is handled with meticulous care. Slade doesn’t shy away from discussing the complexities of relationships, both romantic and platonic. Her portrayal of the challenges faced by both women, tailored to their respective temporal contexts, invites readers to reflect on universal truths about human nature and societal progression.

Stylistically, Slade’s prose is a mix of eloquent narrative and dialogue, which balances effectively between descriptive and introspective. Her attention to detail in setting scenes—whether the bustling streets of modern-day New York or a quiet, leafy suburb in the 1950s—adds a palpable authenticity to the dual storylines. Additionally, Slade’s incorporation of vibrant secondary characters further enriches the narrative, providing additional perspectives and subplots that weave into the main storyline with purpose and intrigue.

A significant highlight of the book is its closure—which, without veering into the territory of spoilers, is both satisfying and thought-provoking. Slade ensures that the resolution ties up the loose ends of both narratives, providing a fulfilling conclusion while still leaving certain elements to the readers’ imagination, which is a testament to her respect for the audience’s interpretative scope.

There are certain minor criticisms, perhaps, in the occasional pacing issues, where the swapping between timelines can momentarily disorient. However, this is a small price to pay for a narrative that ambitiously handles a complex structure with finesse and artistry. Additionally, while the romance genre might not be everyone's cup of tea, Slade’s handling of universal themes and emotional authenticity provides a wider appeal, potentially attracting readers who might not typically gravitate towards romance novels.

In conclusion, Yours, Truly by Leonie Slade is an impressive debut that promises great potential for the novelist. It is a poignant exploration of love across time, wrapped in the pages of engaging prose and compelling storytelling. For those who enjoy character-driven narratives and rich historical parallels, this novel is thoroughly recommended. Its ability to resonate on a deeply personal level might just make it a favorite for many, standing out in a genre that thrives on the exploration of human bonds.