In the enthralling world of romantic suspense, Lexxi James has asserted a potent command with her book "Sins & Lies." This novel not only captivates with its intricate plot and intense emotion, but also enchants through its deep exploration of themes such as trust, redemption, and the blurry lines between right and wrong. Lexxi James masterfully plays with the elements of thrill and mystery intertwined with a fiery romance that keeps the reader glued to the pages.

At its core, "Sins & Lies" tells the story of Anna DeVine, a woman who has closely guarded her life secrets while striving to leave her past behind and forge a new life of normalcy and peace. Her tranquility is disrupted when she encounters the charismatic and secretive Julian Mercer. Julian, a man with an equally shadowy past, is drawn to Anna with a magnetic force that neither of them can resist. As their paths cross, layers of their hidden pasts unravel, exposing a labyrinth of lies, deceit, and betrayal.

Lexxi James does a splendid job of character development. Anna is portrayed as a complex character with a multi-layered personality — strong yet vulnerable, determined yet cautious. Julian, on the other hand, serves as the perfect counterbalance to Anna. His enigmatic presence is captivating, making him both a hero and a puzzle to solve. As their story progresses, James ensures that each character evolves, learns, and confronts their inner demons, which adds a rich depth to the narrative.

The pacing of "Sins & Lies" is meticulously crafted, maintaining a balance between fast-paced action and slow-burn romance. The transitions between scenes are seamless, and James expertly uses suspense to keep the reader hungry for what will happen next. The use of dual perspectives enhances the reader's understanding and engagement, giving us a window into both Anna and Julian’s thoughts and emotions which are fraught with intensity and passion.

Apart from the main characters, the secondary characters are not just fillers but add substantial value to the story. They are well fleshed out and contribute significantly to the plot’s progression as well as to the main characters' growth. Characters like Michael, Anna’s protective older brother, and Tessa, Julian’s sharp-witted assistant, provide additional layers of intrigue and humanity to the tale.

Lexxi James's writing style is eloquent and vivid. Her ability to describe scenes and emotions with clarity pulls the reader into the story, making them feel every heartbeat and breath of the characters. The dialogues are crisp and purposeful, often laced with underlying meanings that reveal much about the characters’ personalities and their complex relationships.

The thematic presence in "Sins & Lies" is potent and thought-provoking. The discussion of 'sins' and moral ambiguity runs as a continuous undercurrent throughout the book. Both Anna and Julian are depicted not merely as protagonists but as flawed human beings who have made questionable choices. This portrayal challenges the reader to ponder the essence of sin and redemption, making it clear that the world isn’t merely black and white, but often a shade of gray.

Romance in the novel is both steamy and tender. Lexxi James ensures that the chemistry between Anna and Julian is not only physical but emotional and intellectual as well. Their interactions range from passionately charged to vulnerably soft, which makes their relationship realistic and relatable.

However, while "Sins & Lies" thrives in character portrayal and plot intrigue, there are moments when the details may feel overly intricate, potentially overwhelming for some readers. The backstories are detailed, which is essential for the story’s depth, but might seem too exhaustive in certain parts, slightly slowing down the narrative pace.

In conclusion, "Sins & Lies" by Lexxi James is a compelling blend of suspense, intrigue, and romance. It's a book that not only provides an adrenaline rush but also tugs at the heartstrings and provokes deep reflection on personal ethics and the complexities of human nature. For fans of the genre and new readers alike, this novel promises a rollercoaster of emotions, a sophisticated plot, and a thought-provoking journey into the sins and lies that shape our lives.