Hidden But Not Safe, penned by Amber Warden, is a gripping psychological thriller that intricately weaves suspense with the shadows of our deepest fears. The story introduces us to Eliza Cortez, a young woman who appears to lead a normal life externally but holds a chilling secret that haunts her relentlessly. In this page-turner, Warden captivates the readers with her adept storytelling and a penchant for the dark crevices of her characters' psyche.

The narrative opens on what seems like just another day in Eliza's meticulously routine life; however, the smooth facade is shattered when a series of enigmatic notes begin appearing at her doorstep. Each note is more invasive than the last, threatening to expose the past Eliza has fought so hard to bury. With each chapter, Warden cleverly strips away layers of Eliza's seemingly ordinary life, revealing a tumultuous world of deception and fear that festers beneath.

Amber Warden's prose is both elegant and edgy, perfectly balancing the art of storytelling with tension that grips the reader. The pacing of Hidden But Not Safe is methodical and precise, echoing the protagonist’s own need for control over her environment and the secrets she guards. Warden employs a dual narrative technique, shifting between the present and Eliza’s dark past, which illuminates her complex character and the intensity of her current paranoia. This method not only deepens the narrative but also pulls the reader into a compelling empathy with Eliza, making her psychological turmoil almost palpable.

A striking aspect of Warden’s writing is her mastery in crafting atmospheric tension. The settings of the book—a claustrophobic city apartment, a desolate country house, and the stark offices where Eliza works—are more than mere backdrops. They transform into sentient entities that contribute to the overwhelming sense of entrapment and dread that pervades the novel. Each location is depicted with chilling detail, making them an integral part of the story’s oppressive mood.

The supporting characters are well-developed and serve to either heighten the suspense or provide fleeting respite from it. Among them is James, Eliza’s relentlessly optimistic coworker who remains oblivious to her inner turmoil, and Mrs. Redwood, the seemingly benign neighbor whose watchful eyes suggest she knows more than she lets on. These characters do not just populate Eliza’s world; they push the narrative forward and magnify the central themes of trust and betrayal.

Moreover, Warden does not shy away from exploring the psychological depth of her characters, particularly Eliza. Through flashbacks and her interactions with others, readers witness the transformation of Eliza from a hopeful young girl into a profoundly disturbed woman, whose current plight is as much a battle with external threats as it is with her internal demons. This psychological depth adds layers of complexity to the story and challenges the readers to consider the impact of past traumas on present behavior.

However, Hidden But Not Safe is not without its flaws. Some readers might find the pacing initially slow, as Warden takes her time building the foundation of the story. Additionally, the frequent use of flashbacks, while crucial for character development, occasionally disrupts the narrative flow, making it a bit challenging to follow at times. Nevertheless, these are minor compared to the overall compelling and unsettling narrative that Warden successfully executes.

The climax of the book is a crescendo of revelation and raw nerve. Warden masterfully brings all her narrative strands together in a finale that is both satisfying and heart-wrenching. The resolution to Eliza’s story is not merely a conclusion of events but a profound commentary on the human condition and the extremes to which one might go to preserve a semblance of normalcy and safety.

In conclusion, Amber Warden's Hidden But Not Safe is a formidable entry into the genre of psychological thrillers. It offers not only edge-of-the-seat suspense but also a deep dive into the complexities of human emotions and traumas. This book will likely appeal to fans of Gillian Flynn and S.J. Watson, and to any reader looking for a story that combines psychological depth with relentless suspense. Warden’s novel is a reminder of the potent, lingering impact of our past and the sometimes invisible chains it places on our present, making it a worthy and haunting read.