"You're the fellow they call the 'Laboratory Sleuth,' aren't you?" Hale smiled at mention of the nickname reporters had tagged on him some time ago. At first he had been put out when the newspapers smeared the brand of sensationalism on his profession; then, as he found his business doubled overnight, he decided free advertising of that nature had its advantages. His fees were high; but not exorbitant in view of the fact that he was never called until everyone else had failed. The complete series, fully illustrated.