The mystery of Angelina Frood opens with a medical practitioner entering a shadowy web of circumstances after taking over a practice in London. When summoned late at night to attend to a woman with unexplained injuries, he confronts a situation marked by emotional distress and ambiguous violence. A subtle sense of unease permeates his first encounter with the patient, whose identity is obscured under an alias. As details emerge, the narrative reveals troubling connections between her past, her unstable husband, and the psychological toll of sustained abuse. The central figure becomes increasingly entangled in the lives of these individuals, even as he relocates to a quieter setting in search of professional peace. The presence of the same dangerous man reappears, deepening the tension and raising the stakes. Conversations between the practitioner and the woman disclose the gravity of her situation, touching on manipulation, isolation, and dependence. This introduction gradually layers suspense and emotional complexity without relying on conventional mystery tropes. It highlights personal vulnerability and moral responsibility, drawing the reader into a world where menace operates through secrecy and trust is hard-won.