A. J. Grainger is a British young adult fiction writer known for her gripping narratives and well-crafted characters. Her debut novel, "Captive," which was published in 2015, received positive attention from readers and critics alike for its suspenseful plot and exploration of complex themes such as freedom, control, and the costs of security in a contemporary setting. Since then, Grainger has continued to contribute to the YA genre, earning recognition for her ability to tackle difficult subjects with nuance and empathy. Her writing often delights fans of thrillers and psychological dramas within the teen and young adult readership. Please note that details about authors can change over time, so for the most current information, it would be best to look up recent publications and news about A. J. Grainger.