Bridge of time by Lewis Buzbee is a perfect book for older readers who are interested in earning the Time Travel badge. A wrinkle in time propels best friends Lee Jones and Jones Lee back to the summer Mark Twain spent in San Francisco. The class trip they were on was a total loser, so they snuck away to discuss the pending divorces of their parents. Upon awaking from a nap in a lighthouse they find the Golden Gate bridge has fanished, their cell phones don't work, and they are clueless as to how to get back to their class and/or time. Then they meet this young man named Sam Clemens who is on the run from a mysterious stranger, who soon is after Lee and Jone, too. A suspenseful summer, sci-fi, time-travel treat for all those who delve into its pages.