They considered the matter of disguise.
Disguises are all right and in many cases a valuable aid to a detective.
But they are not infallible.
In a passing crowd or the glare of gaslight they will prove sometimes very effective.
But not always are they effective. The cunning crook penetrates the cleverest disguise with ease.
Every person has certain physical peculiarities which no disguise on earth can absolutely conceal.
The Bradys knew that they could not depend wholly upon disguise.
The detectives decided finally that their only way to baffle their murderous foes was to make a literal race of it.
They knew that the three crooks would make hot pursuit.
By keeping always just ahead of the trio they could be sure of safety and perhaps find a way of doubling and turning the tables on the foe.