Bridge of Time — Lewis Buzbee

Best friends Lee Jones and Joan Lee have a lot more in common besides their names. On the eve of their class trip, they each learn their parents are getting divorced. Ugh. The class trip is a dud, so Lee and Joan steal away to talk. What follows is an afternoon nap in a lighthouse, walking up to find the Golden Gate Bridge gone--gone!--and meeting a young man named Sam Clemens, who is on the run from a mysterious stranger.

Lee and Joan wonder: Where are they? What year is it? Why don't their cell phones work? How will they get back? Do they even want to? Will life ever be the same?