Sara Ochs' This Stays Between Us is a gripping psychological thriller that delves into the complexities of friendship, guilt, and the haunting nature of secrets. Set against the vibrant backdrop of Australia, the novel weaves a tale that is as much about the internal landscapes of its characters as it is about the external mysteries they face. Ochs crafts a narrative that is both suspenseful and introspective, inviting readers to question the very nature of truth and the lengths one might go to protect it.

The story unfolds in two timelines: ten years ago, during a study abroad program in Australia, and the present day, as Claire is called back to the scene of her best friend Phoebe's disappearance. This dual timeline structure is a powerful narrative device that Ochs employs with finesse, allowing the reader to gradually piece together the events leading up to Phoebe's tragic fate. The juxtaposition of past and present not only builds suspense but also deepens our understanding of the characters' motivations and the evolution of their relationships.

At the heart of the novel is the friendship between Claire and Phoebe, a bond that is both intimate and fraught with tension. Ochs skillfully explores the dynamics of this relationship, capturing the intensity of adolescent friendships and the ways in which they can be both nurturing and destructive. Claire, as the protagonist, is a complex character whose internal conflict drives much of the narrative. Her guilt over Phoebe's death is palpable, and Ochs does an excellent job of portraying the psychological toll it takes on her. Claire's journey is one of self-discovery and redemption, as she grapples with the burden of her secret and the fear of its revelation.

The supporting characters are equally well-drawn, each with their own secrets and motivations. Ochs creates a rich tapestry of personalities, from the charismatic yet enigmatic Phoebe to the other members of the study abroad group, each of whom plays a crucial role in the unfolding mystery. The author deftly explores themes of trust and betrayal, as the group's camaraderie is tested by the weight of their shared history and the secrets they keep from one another.

One of the novel's strengths is its vivid setting. Ochs brings Australia to life with her evocative descriptions of its landscapes, from the sun-drenched beaches to the bustling cities. This vibrant backdrop serves as a stark contrast to the dark undercurrents of the story, highlighting the duality of the characters' experiences. The setting is not merely a backdrop but an integral part of the narrative, reflecting the characters' internal struggles and the sense of adventure and danger that permeates the story.

Thematically, This Stays Between Us explores the idea of truth and the subjective nature of memory. Ochs raises thought-provoking questions about the reliability of our perceptions and the ways in which we construct our own narratives to cope with trauma. The novel also examines the moral ambiguity of Claire's actions, challenging readers to consider the ethical implications of her choices and the extent to which she is culpable for Phoebe's death.

In terms of pacing, Ochs maintains a steady tension throughout the novel, with each chapter revealing new layers of the mystery. The gradual unveiling of secrets keeps the reader engaged, and the climactic revelations are both surprising and satisfying. Ochs' writing is crisp and engaging, with a keen eye for detail and a talent for creating atmosphere. Her prose is both accessible and evocative, drawing readers into the world she has created and keeping them hooked until the very last page.

Comparatively, This Stays Between Us shares thematic similarities with other psychological thrillers such as Gillian Flynn's Gone Girl and Ruth Ware's The Lying Game. Like Flynn and Ware, Ochs delves into the darker aspects of human nature, exploring themes of deception, guilt, and the complexity of female friendships. However, Ochs brings her own unique voice to the genre, crafting a story that is both original and compelling.

Overall, This Stays Between Us is a masterful exploration of the human psyche, a novel that is as much about the secrets we keep from others as it is about the ones we keep from ourselves. Sara Ochs has crafted a suspenseful and thought-provoking tale that will resonate with readers long after they have turned the final page. For those who enjoy psychological thrillers with depth and nuance, this book is a must-read.