Mortal Fear

Robin Cook's 1989 medical thriller moves fast and asks real ethical questions — about DNA research, euthanasia, and who controls the origins-of-life science. Dr. Jason Howard makes a credible protagonist, and the escalating conspiracy builds genuine menace. The New York Times called it 'a chilling odyssey' and the pacing justifies that description. Two honest caveats: the plot threads through Boston's adult underworld include sexual content and violence that place this firmly in adult-reader territory, and Cook's lone-doctor-versus-conspiracy formula is one he repeats across many novels. The genetic science also feels dated after three decades of real-world advances. Solid thriller craft for adult readers who enjoy the genre; not appropriate for younger audiences.