A new colleague's unsettling imitation escalates from professional rivalry to a terrifying personal invasion. The protagonist finds her life meticulously mirrored and usurped by a younger, more confident woman at work, who begins by taking over her responsibilities and escalates to adopting her style and social life. The narrative framework appears to be a first-person account, detailing the protagonist's growing paranoia and desperate attempts to reclaim her identity and autonomy from this increasingly invasive presence.

This novel is characterized as a 'truly creepy tale of jealousy and obsession' by Woman & Home, and People describes it as a 'hypnotic dance of gaslighting and revenge.' I News notes its potential to provoke strong reactions, suggesting it's 'guaranteed to start the mother of all office fights.' The reception highlights the book's effectiveness in creating a tense atmosphere and exploring dark psychological themes.