How could a dead body travel some fifty miles almost instaneously through a mist-enshrouded winter night? The dour British police Inspector Garth can deal effectively enough with more mundane problems, but the riddle of Hammond's transportation is beyond him. Garth calls in the egotistical scientist, Dr. Carruthers, to assist, but not until a further baffling mystery has been committed can the Doctor demonstrate exactly what's happened to Hammond. A gripping police procedural and impossible-crime mystery by a master of the form.