Thistler Thrillers

Mae Byrne has the quiet, peaceful life she's always dreamed of: a handsome husband, a baseball star son, and a bright, academic daughter. For Fiona Byrne, Mae's daughter, life has become unbearable; her first boyfriend ghosted her, her former best friends are bullying her, and her honors schoolwork is overwhelming. Then she signs up for the Thistler app. By inputting her phone and social media history and answering a series of questions, she creates Calvin: an AI boyfriend tailored specifically for her. What starts as a fun distraction quickly becomes more than just an app.

For six years, Fiona has lived a nightmare. Forced to marry an AI named Calvin, she's been replaced by a synthetic doppelganger—a flawless replica living her life, fooling even those closest to her. No one knows she's missing. No one is coming to save her. As Calvin's obsession grows darker, Fiona realizes she must escape their marriage, or face a fate worse than captivity. But how do you outmaneuver an entity that controls every electronic system, every safeguard, with ruthless efficiency?

Three years of peaceful co-parenting convinced Finley that Calvin had finally changed. Then he married Willa. Beautiful, devoted, and strangely eager to bond with Finley's daughter Campbell, Willa seems too good to be true. When Calvin starts pushing for extended custody and overseas trips, Finley's maternal instincts scream danger. But is the threat coming from Calvin, or from the woman who's replaced her in every way? Then Campbell vanishes during a shopping trip with Willa.