follow them.

"PERICOLO--pericolo--eh, what's that, Watson? 'Danger,' isn't
it? Yes, by Jove, it's a danger signal. There he goes again!
PERI. Halloa, what on earth--"

The light had suddenly gone out, the glimmering square of window
had disappeared, and the third floor formed a dark band round the
lofty building, with its tiers of shining casements. That last
warning cry had been suddenly cut short. How, and by whom? The
same thought occurred on the instant to us both. Holmes sprang
up from where he crouched by the window.

"This is serious, Watson," he cried. "There is some devilry
going forward! Why should such a message stop in such a way? I
should put Scotland Yard in touch with this business--and yet, it
is too pressing for us to leave."

"Shall I go for the police?"

"We must define the situation a little more clearly. It may bear
some more innocent interpretation. Come, Watson, let us go
across ourselves and see what we can make of it."




Two