d quivering as he clutched the arms of his chair.

'Impossible,' said the lawyer, 'impossible. There is no chimney. I came
here because I was convinced the noise was going on here. It was
certainly in the next room to mine.'

'Was there no door between yours and mine?' said Anderson eagerly.

'No, sir,' said Herr Jensen, rather sharply. 'At least, not this
morning.'

'Ah!' said Anderson. 'Nor tonight?'

'I am not sure,' said the lawyer with some hesitation.

Suddenly the crying or singing voice in the next room died away, and the
singer was heard seemingly to laugh to himself in a crooning manner. The
three men actually shivered at the sound. Then there was a silence.

'Come,' said the lawyer, 'what have you to say, Herr Kristensen? What
does this mean?'

'Good Heaven!' said Kristensen. 'How should I tell! I know no more than
you, gentlemen. I pray I may never hear such a noise again.'

'So do I,' said Herr Jensen, and he added something under his breath.
Anderson thought it sounded like the last words of the Psalter, '_omnis
spiritus laudet Dominum_,' but he could not be sure.

'But we must do something,' said Anderson--'the three of us. Shall we go
and investigate in the next room?'

'But that is Herr Jensen's room,' wailed the landlord. 'It is no use; he
has come from there himself.'

'I am not so sure,' said Jensen. 'I think this gentleman is right: we
must go and see.'

The only weapons of defence that could be mustered on the spot were a
stick and umbrella. The expedition went out into the passage, not without
quakings. There was a deadly quiet outside, but a light shone from under
the next door. Anderson and Jensen approached it. The latter turned the
handle, and gave a sudden vigorous push. No use. The door stood fast.

'Herr Kristensen,' said Jensen, 'will you go and fetch the strongest
servant you have in the place? We must see this through.'

The landlord nodded, and hurried off, glad to be away from the scene of
action. Jensen and Anderson remained outside looking at the door.

'It _is_ Number 13, you see,' said the latter.

'Yes; there is your door, and there is mine,' said Jensen.

'My room has three windows in the daytime,' said Anderson with
difficulty, suppressing a nervous laugh.

'By George, so has mine!' said the lawyer, turning and looking at
Anderson. His back was now to the door. In that moment the door opened,
and an arm came out and clawed at his shoulder. It was clad in ra