From the back of the book:
"1763 -- Gideon Seymour, thief and gentleman, hides from the villainous Tar Man. Suddenly the sky peels away like fabric and from the gaping hole fall two curious-looking children. Peter Schock and Kate Dyer have fallen straight from the twenty-first century, thanks to an experiment with an antigravity machine. Before Gideon and the children have a chance to gather their wits, the Tar Man takes off with the machine -- and Peter and Kate's only chance of getting home. Soon Gideon, Peter, and Kate are swept into a journey through eightenth-century London and form a bond that, they hope, will stand strong in the face of unfathomable treachery."
This really is a charming book that I think most kids would truly enjoy, most adults as well. Even though there are a number of time travel stories out there, and I've only read a few; I do recommend this one: it's clean; the history is well-researched and an integral part of the story; the characters are three-dimensional and interesting; and there is plenty of humor and intrigue.
Catching Up Challenge