Bridge of Time

"On the eve of their class trip, best friends Lee Jones and Joan Lee each learn their parents are getting divorced. When their class trip turns out to be a dud, they sneak away to the old lighthouse to discuss this new 'divorce stuff.' When they unexpectedly fall asleep, they wake up to find San Francisco as they knew it gone -- and meet 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?"--from back cover.