Abe Lincoln at Last! — Mary Pope Osborne

Are you ready for a presidential adventure? Jack and Annie are! They are trying to get a special feather that will help save Merlin's baby penguin, Penny. When the magic tree house whisks them back to Washington, D.C., in 1861, Jack can't wait to meet Abraham Lincoln himself! But the new president is too busy to see them, as he is desperately trying to save a nation in crisis.

When Jack and Annie ask for some magical help, they go back even further in time to a mysterious woods. Are these the same woods where Abraham Lincoln takes his daily horse ride? If so, can an orphan named Sam help them find Abe? Or will Jack and Annie have to help Sam instead?

It's a race against time as Jack and Annie try to do the right thing. Plus, they still have to aid a president and a troubled nation, as well as get the object that will save Penny the penguin!