"When Piper and Peter Post find a curious postcard from Kentucky, they get most suspicious! After all, it's addressed "Dear bats," and they don't think the writer means baseball bats. So they set off on a family vacation to a famous, enormous bat-filled cave in--where else? Kentucky--to solve the postcard mystery". Includes trivia on bats, Mamouth Cave and Fort Knox, and highlights SAT words important for kids to know.