't. Only
I'm sure of one thing--he is an enemy of mine--and of my father."

"Can you recall anything of your father--or mother?" asked Mrs. Racer
softly.

"No," answered Paul with a shake of his head; and tears filled his eyes.

"Well, I know one thing!" exclaimed Frank decidedly. "I'm going to
have another try at finding that man. I'm sure he's in this vicinity
now. He's hanging around here for some reason, and we have a double
motive in locating him. I believe he set our boat on fire," and for
the first time he told his parents of his suspicions.

"Be careful if you do meet him," cautioned Mr. Racer. "He is evidently
a dangerous character. Now to see what the police can do, and then
we'll go back to bed."

The police could do very little, as might be expected, though they
promised to keep a lookout for the fellow. They made an utterly
useless inspection of the house and grounds, and left. Then the family
and Paul went to bed to get what little sleep they could.

Frank and Andy discussed the matter long and earnestly the next day.
Paul was not so well, on account of the fright, and so it was not
thought wise to have him accompany them on a sailing trip.

"I'm not so sure it will do any good to go off in our boat," declared
Andy. "That fellow is just as likely to be on land as at sea."

"I think he's more likely to be at sea," declared Frank. "He wants to
get that damaged motor boat."

"Well, let's try looking for him ashore a while and if that doesn't
amount to anything, I'll go sailing with you," suggested the younger
brother.

To this Frank agreed; and for several days he and his brother went from
one seacoast settlement to another, making inquiries. Nothing,
however, came from them. They spent much time riding back and forth on
the electric car line, hoping they might unexpectedly meet the
mysterious man there, but he kept out of their way as if he knew they
were on his trail.

"Well, now for a sailing cruise!" exclaimed Frank, one morning, and
Andy announced that his theory had been tried and found wanting. The
brothers wanted to take Paul, but he was not well enough, so, having
taken along a supply of provisions, if they should be becalmed and kept
out all night, as was sometimes the case, they set sail, beating up
along the coast.

There was a fair wind, that freshened at noon, but which died out
toward evening, and finally there settled over the ocean a dead calm.

"It's us out for