11--Prof. Turnbull.
12--Second Door-man.
13--Miss Hunsicker.
14--Attendant.
15--Miss Blake.
16--Officer.]

Sixteen persons! Ten in view from the steps and six not. Of the sixteen,
only the following seemed to afford any excuse for future interrogation:
Numbers Two, Six, Ten, Seven, Eight and Thirteen. Making a mental note of
these, during which operation the poor unfortunates who had just been
considering themselves as quite out of the game revived in a startling
manner under his eye, he proceeded on his way.

As the action has now shifted to the upper floor, a diagram of this
second story is now in order.

As you will see, a straight glimpse is given down either gallery from the
arches opening into the broad corridor into which Mr. Gryce had stepped
on leaving the central staircase. He had therefore only to choose which
of the two would better repay his immediate investigation.

He decided upon the northern one, which you will remember was the one
holding the tapestry; since, to find anybody there, no matter whom, would
certainly settle the identity of the person responsible for that flying
arrow. For, as all conceded, too little time had elapsed between its
delivery and the discovery of the victim for the quickest possible
attempt at escape to have carried the concealer of the bow very far from
the spot where he had thrown it. It was possible--just possible--that he
might have got as far as one of the four large rooms opening into the
corridor stretching across the front, but that he was not in the gallery
itself Mr. Gryce soon convinced himself by a rapid walk through its
entire length.

That he did not follow up this move by an immediate searching of the
rooms I have mentioned was owing to a wish he had to satisfy himself on
another point first.

What was this point?

In passing along the rear on his way to this gallery, he had noticed the
narrow staircase opening not a dozen feet away to his left. This
undoubtedly led down to the side-entrance. If by any chance the user of
the bow had fled to the rear instead of to the front, he would be found
somewhere on this staircase, for he never could have got to the bottom
before the cry of "Close the doors! Let no man out!" rendered this chance
of immediate exit unavailable. So Mr. Gryce retraced his steps, and
barely stopping to note the boy eying him with eager glances from the
doorway of Room A, he approached the iron balustrade guarding the small
staircase,