Dear Jack,

I just saw that you posted the solution as I was making my post. Having now seen the answer, I'll be able to sleep more peacefully tonight!

Sincerely,
Rush

Got it!

Any more puzzles like this? I love logic problems!

Dear Jack,

You have come up with a toughie! I will see if I can try to come up with an answer tomorrow morning when I have a little time and a clearer brain...that is, unless we already have the answer by then!

Sincerely,
Rush

Without looking at the solution (I'll post again after I see if I'm right...)

The robber is Mr. Miller!

Suspect	House	Car
Miller	Green	Dodge
Allen	Blue	Ford
?	Red	Chevrolet

? = Unnamed third suspect.

Now, let's see how I did...