"Well?"

"The commissioner asked me yesterday if I knew of a church in the
city that had a slender spire with a green top and two poplars in
front of it."

Muller looked his interest.

"I thought it might possibly be the Convent Church of the Grey
Sisters, but I wasn't quite sure, so I went there an hour ago. It's
all right, just as I thought. And I suppose it has something to do
with the case of last night, so I thought I had better report at
once. I was on my way to the station."

"That will do very well. You have saved us much time and you have
shown that you are eminently fitted for this business."

"If you really will try me, then - "

"We'll see. You can begin on this. Come to the church with me now."
Muller was no talker, particularly not when, as now, his brain was
busy on a problem.

The two men walked on quickly. In about half an hour they found
themselves in a little square in the middle of which stood an old
church. In front of the church, like giant sentinels, stood a pair
of tall poplars. One of them looked sickly and was a good deal
shorter than its neighbour. Muller nodded as if content.