"You are Spencer Vance."
The young man could not conceal an expression of extreme astonishment.
"Who told you my name was Spencer Vance?"
"It matters not, but take heed; do not go out on the sea to-night."
"I tell you I must! I will go, but you must tell me what you know of Spencer Vance."
"You are a revenue detective; you are in the employ of the Government; you have been betrayed, and to-night you are to be silenced if you go out on the yacht!"
"Do the men on the yacht know who I am?"
"They do not know your name, but they suspect you are a Government detective, and they have determined to put you out of the way; to-night they will do the deed if you go."
"Someone must have told them I was a Government officer."
"Yes; someone told them."