Fyne's dog who saved Flora de Barral's life is the last dog-friend I had.

I was rather lonely cruising about; but that, too, on the river has its charm, sometimes.

I chased the mystery of the vanishing Powell dreamily, looking about me at the ships, thinking of the girl Flora, of life's chances--and, do you know, it was very simple." "What was very simple ?" I asked innocently.
"The mystery." "They generally are that," I said.
Marlow eyed me for a moment in a peculiar manner.
"Well, I have discovered the mystery of Powell's disappearances.

The fellow used to run into one of these narrow tidal creeks on the Essex shore.

These creeks are so inconspicuous that till I had studied the chart pretty carefully I did not know of their existence.