A fast-paced medical thriller by Robin Cook. The story follows Dr. Angela Dawson, a resident at a major Boston hospital, who becomes concerned when a series of routine surgical patients unexpectedly fall into comas after their operations.

As Angela investigates the mysterious cases, she discovers a disturbing connection between the victims and a large medical outsourcing company. What initially appears to be a tragic coincidence soon reveals a far-reaching conspiracy involving healthcare corporations, profit-driven decisions, and dangerous medical practices.

With mounting pressure from hospital administrators and powerful business interests, Angela risks her career and personal safety in her search for the truth. Combining authentic medical detail with suspense, mystery, and corporate intrigue, Critical is a gripping exploration of modern healthcare and its hidden dangers.