NEW YORK TIMES BESTSELLER • Another page-turning installment in the Jeremy Logan series: A long-lost experiment of unknown intent … a hidden room in a vast seaside estate … an investigator marked for danger …

On a sprawling estate on the coast of Rhode Island, at the nation’s oldest and most prestigious think tank, an unfathomable tragedy takes place. No one knows what to make of the disturbing evidence left behind. Then reports begin to surface of increasingly bizarre behavior among the organization’s distinguished scientists.

Called upon to investigate these strange happenings, history professor and analyst of inexplicable phenomena Jeremy Logan comes across an ingeniously concealed room in a long-dormant wing of the mansion. What he discovers within may provide answers—and, in the process, unleash a new wave of catastrophe.