Andy & Mark and the Time Machine

In the second book of the series, Andy & Mark race home from the baseball field and discover that a mystery intruder has activated the time machine! Worse than that, someone has traveled back in time and changed history – the United States is gone! The new world is mired in violence and the population has no hope. The boys’ mission is clear. Find out what happened, return to the past, and stop the person that disrupted the time line. But the new world has some surprises, and the task proves harder than it sounds. Follow along as the Andy & Mark befriend a local girl, dodge the secret police, and meet an interesting cast of historical characters.