," he said, "you're immense--you oughter be in the business.
Say, when are we going to nail this guy?"

"Well," said Green, "I think we should start watching his movements at
once, but we should wait until we are pretty sure of the correctness of
our theory before acting. And of course, in the meanwhile, we must
deport ourselves in such a way as to avoid arousing his suspicions."

"Just leave that to me. You do the expert thinking on this here case;
I'll guarantee a good job of trailing."

Inside of forty-eight hours these two, working discreetly, knew a good
deal of their man. For example, they knew that under the name of
Morrison he was living in a summer boarding house on a little hill
rising to the west of the park; that he had been living there for a
little more than a fortnight; that his landlady didn't know his
business, but thought that he must be an invalid. Among the other
lodgers the impression prevailed that he suffered from a nervous
trouble. Mornings, he kept to his room, sleeping until late. In fact, as
well as the couple occupying the room below his might judge, he did most
of his sleeping in the daytime--they heard him night after night,
walking the floor until all hours.

A maid-servant of ultra conversational tendencies gratuitously furnished
most of these valued details, after Michael J. Cassidy had succeeded in
meeting her socially.

Afternoons, the suspect followed a more or less regular itinerary. He
visited the manicure girl at the new barber shop; he patronized one or
both of the moving picture places in the vicinity, but usually both, and
then he went for a solitary walk through the park, and along toward dusk
he returned to the boarding house, ate his supper and went to his room.
He had no friends, apparently; certainly he had no callers. He received
no letters and seemingly wrote none. Cassidy was convinced; he burned
with eagerness to make the arrest without further delay. For this would
be more than a feather in the Cassidy cap; it would be a whole war
bonnet.

"You kin stay in the background if you want to," he said. "Believe me,
I'm perfectly willing to take all the credit for pulling off this
pinch."

As he said this they were passing along Broadway just above the subway
terminal. The straggling line of new shops was on one side and the park
stretched away on the other. Green was on the inner side of the
pavement. Getting no answer to his suggestion, Mr. Cassidy started to
repea