“I believe you have hit it.”

“Not a doubt of it. It is a very urgent message, thrice repeated to make it more so. But beware of what? Wait a bit, he is coming to the window once more.”

Again we saw the dim silhouette of a crouching man and the whisk of the small flame across the window as the signals were renewed. They came more rapidly than before⁠—so rapid that it was hard to 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—”