"How did YOU get in?" asked Miss Erith, flushed with chagrin and
disappointment.

"With keys, ma'am."

"Oh, Lord!" said Vaux, "we jimmied the door. What do you think of
that, Cassidy?"

"Did you so?" grinned Cassidy, now secure in his triumphant priority
and inclined to become friendly.

"I never dreamed that your division was watching Lauffer," continued
Vaux, still red with vexation. "It's a wonder we didn't spoil the
whole affair between us."

"It is that!" agreed Cassidy with a wider grin. "And you can take it
from me, Mr. Vaux, we never knew that the Postal Inspection was on
to this fellow at all at all until you called me to stop outgoing
letters."

"What have you on him?" inquired Vaux.

Cassidy laughed:

"Oh, listen then! Would you believe this fellow was tryin' the old
diagonal trick? Sure it was easy; I saw him mail a letter this
afternoon and I got it. I'd been waiting three months for him to do
something like that. But he's a fox--he is that, Mr. Vaux! Do you
want to see the letter? I have it on me--"