Mad Eyes by Kenneth Robeson

COLONEL JOHN RENWICK, famous engineer, was standing his companion's hair on end. William Harper Littlejohn, noted archaeologist and geologist, was not a man to have shivers sent easily through his scalp.

But when it came to driving a big car with a fast motor over a rainy highway in the night, Colonel Renwick, otherwise known as "Renny," seemed to have no sense of either speed or safety.