The city's fate relies on four young students: Civil War veteran Marcus Mansfield, brash Bob Richards, meticulous Edwin Hoyt and the eccentric but brilliant Ellen Swallow. Together, they are The Technologists. In a climate of rising hysteria, these four courageous individuals must unite against the forces of darkness to uncover the mastermind before he can stage his greatest outrage. 'An ingenious, sometimes terrifying, historical thriller' Independent 'Vivid.frightening. The Technologists is a marvel' Washington Post 'Pearl takes an unusual subject for a thriller and seamlessly weaves historical research and his own inventions into a satisfying story' Sunday Times