This man looked like a doctor or a dentist perhaps.

Beyond the matter of size, similarity to Mack Nolan ceased.

The Cadillac man wore a vandyke beard and colored glasses, and a panama and light gray business suit.

Casey set him down in his mental catalog as "some town feller" and assumed that they had nothing in common.
Yet Mack Nolan heard nearly every word spoken by Smiling Lou, Casey and Jim Cassidy.

(Readers are so inquisitive about these things that I felt I ought to tell you--else you'll be worrying as hard as Casey Ryan did later on.