Step into the thrilling and cerebral world of Sarah Mackay, a physicist whose curiosity extends far beyond equations and particles. In "Nine Days Immersed in Private Investigation (in New York)," Sarah leaves the ordered realms of science for the chaotic, high-stakes world of private investigation. After bidding a bittersweet farewell to Tomasz Nowak, her steadfast partner, Sarah embarks on a nine-day course in New York, a city as complex and mysterious as the human behaviors she seeks to unravel.

Guided by grizzled detective Frank Delaney, Sarah dives into the art of surveillance, the psychology of deception, and the cutting-edge use of forensic science. As each day passes, her scientific precision meets the unpredictability of human nature, creating a unique lens through which she navigates the secrets of the bustling metropolis. However, this is no mere academic pursuit. Shadows from Sarah's own life creep into the narrative: an unknown man begins following her, cryptic messages disrupt her sense of security, and the city itself seems to pulse with unseen danger.

Tomasz's distant yet supportive presence looms as Sarah faces escalating threats and ethical dilemmas. The love they share becomes both a strength and a vulnerability as Sarah realizes that her investigations might jeopardize more than her safety—they could unravel the delicate ties that hold her world together.

A compelling fusion of intellectual rigor, mystery, and emotional depth, this story invites readers to explore the boundaries of knowledge, love, and courage. "Nine Days Immersed in Private Investigation (in New York)" is perfect for fans of thrillers that challenge the mind and stir the heart.