Room One Hundred and Four: Shock and Awe by Ember Davis is a compelling narrative that intricately weaves suspense, emotion, and a profound psychological depth across its chapters. Set within the haunting confines of a seemingly ordinary hotel room, the novel unfolds a tale that transcends the ordinary, plunging the reader into a heart-wrenching journey of discovery, horror, and eventual enlightenment.

The story begins with the protagonist, Anna Leighton, a freelance journalist searching for a fresh story to revive her faltering career. Her path leads her to the enigmatic Hotel Calypso, specifically to Room 104, where a series of unexplained phenomena have been reported. What starts as a routine investigation soon spirals into a series of disturbing experiences that challenge Anna's perception of reality. Davis's narrative style is gripping, adorned with rich descriptions and compelling dialogue that pace the unfolding mystery remarkably well.

The strength of Room One Hundred and Four lies in its deep psychological undercurrents. Davis expertly crafts her characters, especially Anna, whose internal conflicts and past traumas are peeled back layer by layer as the story progresses. The juxtaposition of Anna's skeptical nature against the increasingly inexplicable events in Room 104 serves as a perfect crucible for tension. This tension is not just supernatural but deeply personal, making the reader invest emotionally in Anna's journey.

Ember Davis delves into themes of isolation, identity, and the human psyche. These themes are not just backdrop but are integral to the plot's progression. The hotel itself, with its labyrinthine corridors and stark, occasionally eerie ambiance, mirrors the complexity and hidden depths of the characters inhabiting it. Each guest at the hotel brings their stories, adding layers to the narrative and providing broader social commentaries—on grief, redemption, and the often-blurry line between reality and illusion.

Technically, the novel is a masterpiece in the genre of psychological thrillers. Davis uses an unreliable narrator perspective that plays excellently with the subjective nature of truth and memory. This narrative choice heightens the sense of unreality and suspense, making the reader question what is truly happening in Room 104. The element of 'shock and awe' in the title is aptly justified, as Davis manages to shock with plot twists and awe with the poignant depth of her character studies.

However, no novel is without its flaws. At times, the pacing seems uneven, particularly in the middle sections where the introspective passages, albeit beautifully written, may stall the momentum of the plot. Additionally, some readers might find the final resolution a tad convoluted, as it attempts to tie up multiple thematic threads, which can be overwhelming.

The narrative also excels in setting a visceral atmosphere. The description of the hotel and Room 104 is so vivid that it almost becomes a character in its own right. This detail-oriented writing helps in immersing the reader fully into the setting, making Anna's experiences palpably intense. The interplay of light and shadow, the unsettling silences, and the sudden cacophony of noises in the hotel corridors effectively contribute to the buildup of suspense.

Moreover, Davis's integration of secondary characters is both a tool for diversion and a medium for enriching the main storyline. Characters like the old caretaker, the mysterious couple in the adjacent room, and a skeptical police officer weave in and out of the narrative, each adding a piece to the jigsaw puzzle while maintaining an air of mystery around the core story.

In conclusion, Room One Hundred and Four: Shock and Awe by Ember Davis stands out as an exemplary psychological thriller that goes beyond the surface-level frights. It's a novel that not only entertains but also provokes thought, exploring complex themes through the lens of a suspenseful, tightly wound plot. While it may not cater to all due to its perhaps labyrinthine conclusion and occasionally labored pacing, it certainly makes a mark as a profound piece of literature that challenges and captivates. For those who appreciate depth, complexity, and a bit of cerebral challenge along with their dose of suspense, Ember Davis’s creation promises to be a gratifying read.