as been engaged to
go on that yacht."

"Petzka?" I repeated involuntarily.

"Yes," said Burke, in surprise, "do you know anything about him?"

I turned to Kennedy.

"Not much," replied Craig. "But you can find out about him, I think,
through his wife. He used to be one of my students. Here's her address.
She's very anxious to hear from him. I'm sure that if you have any news
she will be only too glad to receive it."

Burke took the address and a little while later we went ashore.

I was not surprised when Kennedy proposed, as the next move, to revisit
the cellar in the apartment next to Gaskell's house. But I was surprised
at what he said, after we had reached the place.

All along I had supposed that he was planning to wait there in hope of
catching the person who had installed the detectaphone. That, of course,
was a possibility, still. But in reality he had another purpose, also.

We had scarcely secreted ourselves in the cellar storeroom, which was in
a dark corner where one might remain unobserved even if the janitor
entered the cellar, provided he did not search that part, when Kennedy
took the receiving headpiece of the detectaphone and placed it over his
head, quite as if nothing had happened.

"What's the use of that?" I queried. "You ripped the transmitter out up
above."

He smiled quietly. "While my back was turned toward you, so that you
couldn't see," he said, "I slipped the thing back again, only down
further where Gaskell wouldn't be likely to find it, even if he looked.
I don't know whether he was frank with us, so I thought I'd try the
eavesdropping game myself, in place of the man who put this thing in in
the first place, whoever he was."

We took turns listening, but could hear not a sound. Nor did anyone come
into the cellar.

So a good part of the afternoon passed, apparently fruitless.

My patience was thoroughly exhausted when, suddenly, a motion from Craig
revived my flagging interest. I waited impatiently for him to tell me
what it was that he heard.

"What was it?" I asked finally as he pulled the receivers off his head
and stood for a moment, considering.

"At first I heard the sound of voices," he answered quickly. "One was
the voice of a woman, which I recognized. It was the Countess. The other
was the Count.

"'Giulia,' I heard him say, as they entered the room, 'I don't see why
you should want to go. It's dangerous. And besides, it's none of our
business if your father