内容简介：
Well, Dick, here we are in San Francisco at last. "Yes, Tom, and what a fine large city it is." "We'll have to take care, or we'll get lost," came from a third boy, the youngest of the party. "Just listen to Sam " cried Tom Rover. "Get lost As if we weren't in the habit of taking care of ourselves." "Sam is joking," came from Dick Rover. "Still we might get lost here as well as in New York or any other large city." "Boston is the place to get lost in," said Tom Rover. "Got streets that curve in all directions. But let us go on. Where is the hotel?"