"And what will you go to Calistoga for?" he asked.
Jack read him the letter.
"It's a trap, my dear friend," replied the professor.
"Trap or no trap, I'm going," answered Jack.
He rang the bell and called his black servant, Monday.
"What's in de wind now, sah?" asked Monday.
"Pack up. We are going to start for the North."
That afternoon they crossed the bay in the steamer, and taking the steam-cars, reached Calistoga by nightfall.
In the morning they were surprised to hear that "Four-in-Hand Foss" was waiting outside their hotel.
Harkaway went down-stairs and asked to see Mr. Foss.