FOLLOWERS

Cass Vale has 480,000 followers and a feed built on radical authenticity — a life so perfectly framed that somewhere along the way, the real one got lost behind the lens. She’s spent three years turning her kitchen, her mornings, her grief, and her joy into content, and she’s very good at it.

Then a fan account starts posting photographs of her life that she never took.

Same angles as her camera roll. Same moments. Her kitchen at dawn, her building lobby at night, a private cemetery visit she mentioned to almost no one. The account is called @CassWatching. It has no bio. It is growing by the hour.

The police say there’s no crime. Her manager says lean into the engagement. And her boyfriend — carefully, with genuine love — suggests the most frightening explanation of all: that Cass may be doing this to herself, and forgetting. He has concerns. He’s been tracking them.

Before Cass can locate the truth, there’s a management contract she signed at twenty-five without reading page four, a cloud archive she discovers that contains three years of photographs she never posted organized into folders tagged authentic and unguarded and potential, a detective who believes her and cannot act, an access log with seventeen sessions from an IP address that is not hers, a brother she stopped speaking to two years ago over something she refused to believe, and the growing, vertiginous suspicion that the person who knows her platform best has been counting on her not to trust herself.

She’s spent three years performing a self so thoroughly that she can no longer locate the original. He’s been sitting with a grievance she chose not to hear, and he has had access to her camera roll the entire time.

Psychological thriller with dual timeline, binge chapters, and a resolution that accounts for every photograph. The kind of book you read in one sitting and think about for a week.

WHY THIS WILL SELL

→ Mystery, Thriller & Suspense > Psychological Thrillers sits at 4.8 sales-to-comp (Hot Niche) with 180–320 estimated daily sales per top 20 title — surveillance-anxiety titles are outperforming the category baseline by 40% in the first 30 days

→ Dual-category play with Women Sleuths (5.2 sales-to-comp, approaching Hot Mainstream) gives legitimate positioning in a slightly lower-competition category with higher daily sales than the primary

→ Gaslighting thriller in a non-domestic setting — the residential/domestic framing saturates the category; relocating to the digital public sphere is a genuine gap with demonstrated reader demand

→ Dual-timeline structure is the most positively flagged structural choice in current five-star thriller reviews — readers explicitly cite this as the reason they couldn’t stop; the THEN timeline plants clues the NOW timeline cashes in, driving re-read behavior that sustains chart position

→ Definitive resolution is explicitly marketable — growing reader frustration with ambiguous thriller endings means “all questions answered” and “no ambiguous ending” are active conversion signals in this category

→ Influencer protagonist is underserved relative to reader demand — immediate identification across demographics, no specialist knowledge required, and the profession is the novel’s mechanism rather than its subject matter

TROPES:
• Stalker ambiguity
• Gaslighting (definitively resolved)
• Unreliable narrator
• Dual timeline
• Digital paranoia
• Performed identity vs. authentic self
• The comment section as Greek chorus
• Memory gaps with real cause
• The document kept in secret
• The estranged sibling
• The manager who knows too much
• Everyone believes her and cannot help

HEAT LEVEL: Psychological menace — no graphic violence on the page. The threat is intimate, digital, and relentless. Dread and paranoia carry the book. One secondary romantic thread; no HEA. Adult characters throughout.

Perfect for fans of: Sarah Pinborough, Alex Michaelides, A.J. Finn, and Lucy Foley