Magic grows weak as the 20th century draws nearer, and for members of M.I., Britain's first team of wizard spies, every mission might be their last. The clash of man-made electricity with the powers of magic threatens the existence of M.I., which has now been discharged from its own government and is being hunted by one of its own. Myra Wetherby has always feared her visions of mysterious people and places, and her sanity is threatened by a strange empathic connection to those around her. A danger to her family, Myra runs away, falling unwillingly into the hands of the Magical Intelligence team, who need an ability like hers.
