Four Times Forever by Carmen Black is a poignant exploration of love's complexity, its challenges, and the inexorable intertwining of fate and choice. Black's narrative prowess beautifully captures not only the hearts of her characters but also secures a lasting impression on her readers. This novel is a blend of romance, drama, and a dash of supernatural intrigue, making it a compelling read from start to finish.

The story unfolds through the lives of four couples, each uniquely tethered to each other through reincarnation. Black masterfully weaves these separate yet interconnected stories, meticulous in detail, ensuring each character's journey is both distinct and reflective of a larger, shared tapestry. The premise orbits around the idea that these souls are bound through eternity, meeting and re-meeting in various forms and circumstances across several lifetimes.

One of the standout elements of Black's writing is her ability to evoke rich, visceral emotions. From the sunlit streets of 1920s Paris to a quiet, contemporary suburb in New England, the settings are vividly constructed, acting almost as separate characters within the plot. Through these atmospheres, Black not only traverses geography but also the intricate emotional landscapes of her characters. As each couple faces trials, separations, and reconciliations, Black deftly navigates the concepts of destiny versus autonomy.

An intriguing aspect of the novel is how Black uses the supernatural element of reincarnation not as a mere plot device but as a lens to amplify her exploration of deeper themes. Questions about the soul's immortality, the impact of past lives on present circumstances, and the true essence of love are threaded throughout the narrative. This philosophical depth is balanced with heartfelt dialogue and palpable chemistry among the characters, making each reunion and revelation feel both fated and earned.

Character development is another of Black's strengths. Each protagonist, while bound to their soulmate through various lifetimes, is a fully formed individual with distinct fears, dreams, and flaws. For instance, the journey of Evelyn and James is particularly compelling. From their first life together in a war-torn country where they face societal and personal upheaval, through their subsequent lives, we see their characters evolve in response to changing times and personal growth. Their story not only highlights the theme of eternal love but also poses significant questions about the nature of identity and self-awareness.

The narrative also does not shy away from the darker aspects of these repeated encounters. The conflicts are real and often heartbreaking. Black is unafraid to delve into the complexities of relationships that transcend the typical 'happily ever after' arc. This is particularly evident in the life sequences involving Anna and Marco, wherein their love is tested by betrayal and redemption, reflecting the nuanced realities of life and relationships.

Stylistically, Black’s prose is fluid and engaging. Her skillful use of metaphors and similes adds a lyrical quality to the storytelling. While the multiple timelines and characters could easily become convoluted in less skilled hands, Black maintains a clear narrative thread, guiding the reader with ease through the complexities of the plot. The chapters are well-paced, and each conclusion builds anticipation for the next, maintaining a steady engagement throughout the novel.

The marriage of theme and plot in Four Times Forever is, indeed, a testament to Black's literary acumen. The novel’s exploration of the permanence of love and the impermanence of life challenges the reader to contemplate the boundaries of destiny and the power of choice.

However, while the book is largely successful, it is not without minor flaws. Some readers might find the switch between timelines a bit jarring, especially in the earlier chapters before getting fully acquainted with the rhythm of Black's storytelling. Additionally, the ending, although satisfying and fitting with the book's overall themes, might seem somewhat abrupt to those who become deeply invested in the characters’ every incarnation.

In conclusion, Four Times Forever by Carmen Black is a deeply moving narrative that manages to both entertain and provoke thought. Its rich tapestry of characters, eloquent prose, and intricate plotting are sure to resonate with readers looking for a story that combines historical depth with emotional intensity. This novel is a remarkable journey through lives and loves that are inextricably linked, offering a unique perspective on the enduring power of connection across lifetimes.